You might not know the band's name, but you almost certainly know the sound. That wild bass riff at the start of South Park that pops into your head every time you spot Cartman? That's them. And here's one thing that will make you go "aha": that same bassist once auditioned for Metallica and didn't get the job - according to James Hetfield not because he was bad, but because he was too good. We're talking about Primus and their frontman Les Claypool. And here's why you're reading this: Primus Jaroměř is not a typo, but a line in the programme. The band is on the poster of Brutal Assault 2026, taking place at Josefov Fortress near Jaroměř.
Primus Jaroměř: what we know about the performance at Josefov Fortress
Primus are part of the lineup of Brutal Assault 2026 at Josefov Fortress, which kicks off on 5 August 2026 in Jaroměř. This is not a standalone club concert, but one of the headliners of a four-day metal celebration set against the backdrop of an old artillery fortress.
Let's start with what matters most: the place and the context. The phrase Primus Jaroměř is actually tied to the town of Jaroměř in the Hradec Králové region, more precisely to its fortress district of Josefov. That's where Brutal Assault moves every August, and Primus are on this year's bill. In our database the event is listed as Brutal Assault 2026 with a date of 5 August 2026, Josefov Fortress, Jaroměř. The festival releases the exact day-by-day band schedule gradually, so treat the specific day of Primus's set as provisional and follow the organiser's official programme.
The fact that a Californian funk-rock trio has found its way onto an extreme metal lineup is not a programming mistake - it's the whole point. Brutal Assault is a multi-genre extreme metal festival at the 18th-century Josefov Fortress that has grown since its founding in 1996 from a small grindcore event into one of Europe's leading showcases with more than 140 acts. Among the names sharing the poster with Primus you'll find Body Count, progressive Periphery, Nordic Wardruna and symphonic black-metal sorcerers Cradle of Filth.
Les Claypool: the bassist Metallica turned down
Everything about Primus stands or falls with Les Claypool. He is the vocalist, main songwriter and the only continuous member of the band, who turned the bass guitar into the lead melodic instrument.
Leslie Edward Claypool is an American musician, best known as the founder, vocalist, bassist and principal songwriter of Primus. Let's go back to the story from the opening, because it perfectly captures who we're dealing with. After the death of bassist Cliff Burton in 1986, Metallica seriously considered Claypool, a close friend of the band, as Burton's replacement. According to Hetfield, he didn't get the spot because he "was too good" and "should be doing his own thing". Claypool later added that he didn't belong in the band anyway, because he's an oddball by nature.
Why is his playing so unusual? In the vast majority of rock bands the bass just holds down the bottom end and nobody notices it. With Primus it's the other way around. The band inverts the usual roles of a rock lineup: the bass is the lead instrument and the guitar takes a back seat. Claypool, whom Rolling Stone ranks among the greatest bassists of all time, blends tapping, flamenco-style plucking, whammy-bar bends and slapping. Alongside him stands guitarist Larry "Ler" LaLonde, whose background is surprising to the uninitiated: LaLonde played in Possessed, a band often credited as the very first death metal group.
Claypool founded the band long before that. In 1984 he started playing in El Sobrante, California, with guitarist Todd Huth under the name Primate. Today's lineup is no longer the one from the nineties. In 2024 long-serving drummer Tim "Herb" Alexander left Primus due to a "lost passion for playing" and the band began looking for a new drummer. Claypool also has so many side projects outside Primus that it's easy to get lost in them; just to name a few: supergroup Oysterhead and the duo The Claypool Lennon Delirium with Sean Lennon.
A sound that defies categorisation
Nobody can quite pigeonhole Primus. Critics call them funk metal, the band rejects that label, and Claypool once described his music as "psychedelic polka".
If you're expecting classic metal, you'll be surprised. Primus's style draws from progressive rock, metal, funk and psychedelia and is typically described as hard to classify; critics most often reach for the funk metal label, which the band rejects. Claypool has his own line on the matter: he once categorised his music as "psychedelic polka". The funk metal tag annoys him partly because he says he's the only one in the band with any funk background.
The roots of their sound are varied. Critic Stephen Thomas Erlewine aptly wrote that Primus are "post-punk Rush seasoned with the sensibility and humour of Frank Zappa". Add to that the influence of King Crimson and Joe Satriani, with whom LaLonde studied. It's no coincidence that critic Robert Christgau took aim at them in 1993: he called them "probably the weirdest top-10 band ever, and good for them". Live it's also different every time, because their setlist changes night after night and you never know in advance what you'll hear.
Songs you know even if you don't know Primus
Even if you've never heard of Primus, their music has probably reached your ears through television and radio. The most famous is the South Park theme.
Let's start with the most widely seen. Primus composed the South Park theme after the show's creators Trey Parker and Matt Stone admitted they were big fans of the band. It's the piece that even someone who has never heard of Primus in their life knows. The single "Jerry Was a Race Car Driver" also brought them to wider attention. It comes from the 1991 album Sailing the Seas of Cheese, which went gold and produced this alt-rock hit.
Their nineties discography is their solid foundation. The 1993 album Pork Soda went platinum and Tales from the Punchbowl from 1995 received gold certification. In 1993 the band also managed a headlining slot at Lollapalooza. And one story that nicely sums up their reputation: at Woodstock '94, during the song "My Name Is Mud", the crowd started throwing mud at them, which so infuriated Claypool that he stopped playing and told the audience to keep their mud to themselves. And then there's "Wynona's Big Brown Beaver" - an absurdist country-funk-metal single that caused a falling-out with Dave Pirner of Soul Asylum in 1995.
Josefov Fortress: the venue as the main attraction
The festival takes place at Josefov Fortress, an 18th-century military stronghold with a vast underground. That setting turns an ordinary concert into something else entirely, which is why people talk about it as the real headliner.
This is not a field with a stage in the middle. Josefov Fortress was built between 1780 and 1787 and its brick bastions enclose a system of three-storey underground corridors carved into chalk rock, forming a labyrinth roughly 45 kilometres long that you won't find anywhere else in Europe. The Josefov underground is one of the largest underground defensive systems in Europe. In practice this means that alongside the main stages, bands also play in casemates beneath the ground.
What does that do to the experience? The two main stages are built directly facing the fortress walls. In addition to the outdoor stages, performances take place in the underground casemates, and the festival also has galleries and its own horror cinema on site. And if the history of the place itself appeals to you, guided tours are available: in Bastion I and the underground you can see original sculptures from the workshop of Matyáš Bernard Braun, residential casemates and a view from the top of the main rampart. Sound in stone corridors is different from open air, and it's precisely that contrast that makes a concert at Josefov something you won't experience in a regular venue.
Who Primus will share the poster with
The Brutal Assault lineup mixes genres across metal and beyond. Alongside Primus come Nordic Wardruna, blackgaze act Alcest and Canadian veterans Kittie.
That genre diversity is the whole point of the event. The festival runs simultaneously across five stages inside Josefov Fortress, so you can move between sets and mix genres to your taste. From what we have confirmed in our data: on the opening day, 5 August 2026, French Alcest play in the underground, blending black metal with ethereal shoegaze. The following day, 6 August, Canadian veterans Kittie and doom-rock outfit Castle Rat take to the underground corridors.
Add Nordic ritual ambient Wardruna and symphonic black metal Cradle of Filth, and you have a fairly accurate picture of the festival's range. Primus among all of this function as storytellers whose musical eccentricity fits this programming better than it might look on paper. The festival's motto is, after all, "Against violence and intolerance".
Practical tips: transport, tickets, what to bring
Buy tickets through the festival's official channels; the fortress has limited capacity. It's roughly 130 km from Prague and the organiser runs a special train.
First, entry. Primus are part of the festival programme, so you don't buy a separate ticket for them - you need a festival pass. Buy it only through the festival's official website, not from touts; the historic fortress has limited capacity and it pays to sort your ticket well in advance. The entire festival also operates cashlessly via a chip wristband.
Getting there: Josefov is roughly 130 km from Prague. The organiser runs a special train, the Brutal Express, from Prague to Jaroměř and back. Bear in mind that you'll be moving around an old fortress with hills and cobblestones, so sturdy footwear and a rain jacket are not a luxury. And if you're in the region earlier and want something more intimate, on 25 July a jazz-flavoured concert by Dasha & Pajky Pajk Quintet takes place in the castle courtyard in nearby Jaroměřice nad Rokytnou; you can find the singer's profile under Dasha. A full overview of what's playing where is available in our concerts section and in the events calendar.
Frequently asked questions
Where and when do Primus play in Jaroměř?
Primus are on the lineup of Brutal Assault 2026, which takes place at Josefov Fortress in Jaroměř and starts on 5 August 2026 in our database. The specific day and time of their set is determined by the organiser's programme, so check the official website before you travel. Details about the event can be found on the Brutal Assault 2026 page.
Do I have to buy a ticket for the whole festival to see Primus?
Yes, Primus are part of the festival programme, so entry requires a festival pass, not a separate ticket for a single concert. Sales run through the festival's official website and the fortress has limited capacity, so it pays not to hesitate.
What genre do Primus actually play?
Funk metal is the most common label, but the band rejects it. They've mixed their own sound from progressive rock, funk, metal and psychedelia, and Les Claypool has tongue-in-cheek described it as psychedelic polka. Live it tends to be a little different every time, because they change their setlist night after night.
Where might I know their music from if I've never heard of the band?
Almost certainly from the South Park theme, which Primus composed in 1997. Beyond that, their hit "Jerry Was a Race Car Driver" from the album Sailing the Seas of Cheese was a regular on radio playlists.
Who actually plays in Primus today?
The constant is Les Claypool on bass and vocals, with guitarist Larry "Ler" LaLonde by his side. There has been a change behind the drums since long-serving drummer Tim "Herb" Alexander left the band in 2024 and the band began looking for a new drummer.
Sources
- Brutal Assault 2026 - Josefov Fortress, Jaroměř, 5. 8. 2026 (kdykam.com)
- Artist profiles on kdykam.com: Primus, Body Count, Wardruna, Cradle of Filth and events Alcest, Kittie
- Wikipedia: Primus (band), Les Claypool and Josefov Fortress - band history and fortress history
- Wikipedia and Grokipedia: Brutal Assault - origins, move to Josefov, festival format
- Last.fm and lesclaypooltour.com - biography and discography
- Official festival website (brutalassault.cz) - tickets, transport and organisational information