Les Claypool's bass strings: the Primus + virtuoso bass canon, sourced

Documented bass-string gauges, brands, and tunings Les Claypool uses with Primus + his solo + side projects since 1984. Carl Thompson 4-string + 6-string custom basses, La Bella signature relationship, defining cross-genre bass-virtuoso vocabulary. With citations.

Primus · reviewed by the Change Your Strings editorial team · 2026-04-29

Leslie Edward Claypool (born September 29, 1963, Richmond, California) has been Primus's bassist + lead vocalist + bandleader since 1984. The defining cross-genre bass-virtuoso vocabulary in modern rock: slap, tap, fingerstyle, pick, fretless, sub-bass, all deployed across Primus's experimental-rock catalog (Frizzle Fry, 1990, through The Desaturating Seven, 2017). Plays Carl Thompson Custom basses primarily (the canonical Claypool instruments are 4-string + 6-string Carl Thompson originals). La Bella Strings signature relationship. Composed the South Park animated TV theme. Multiple side projects including Oysterhead (with Trey Anastasio + Stewart Copeland), the Claypool Lennon Delirium (with Sean Lennon), and several solo bands.

Progressive rock Funk rock Experimental rock Alternative rock Metal-adjacentE Standard (4-string)

At a glance

Role

Bassist

Active

1984–present

Based

Northern California (Sebastopol-area)

Genres

Affiliations

Primus (bassist + lead vocalist + bandleader, 1984–present)
Oysterhead (bassist, 2000-2001 + 2006 + 2020 reunion, with Trey Anastasio + Stewart Copeland)
Colonel Claypool's Bucket of Bernie Brains (bandleader, 2002–2009)
The Claypool Lennon Delirium (bandleader, with Sean Lennon, 2016–present)
Frog Brigade (bandleader, 2000–present, intermittent)
Sausage (1994 reunion of original Primus lineup with Todd Huth + Jay Lane)
Carl Thompson Custom basses (signature instruments)
La Bella Strings (signature relationship)

Notable credits

Primus, Frizzle Fry (1990)
Primus, Sailing the Seas of Cheese (1991)
Primus, Pork Soda (1993)
Primus, Tales from the Punchbowl (1995)
Primus, The Brown Album (1997)
Primus, Green Naugahyde (2011)
Oysterhead, The Grand Pecking Order (2001)
South Park theme music (Claypool composed the show's theme)

Sourcing3 citations · reviewed 2026-04-29· by Change Your Strings editorial team

Who Les Claypool is

Leslie Edward Claypool, born September 29, 1963, in Richmond, California, has been Primus's bassist + lead vocalist + bandleader since 1984. Across the band's catalog (Frizzle Fry, 1990, through The Desaturating Seven, 2017), he has built the defining cross-genre bass-virtuoso vocabulary in modern rock.

Plays Carl Thompson Custom basses (the canonical Claypool instruments are the 4-string Rainbow Bass + the 6-string Pachyderm bass). La Bella Strings signature relationship. Side projects include Oysterhead (with Trey Anastasio + Stewart Copeland), the Claypool Lennon Delirium (with Sean Lennon), Frog Brigade, and Colonel Claypool's Bucket of Bernie Brains.

Composed the South Park animated TV theme (1997+). Auditioned for Metallica in 1986 after Cliff Burton's death; Metallica passed because they felt his playing was too distinctive.

Style signatures

Three things across the Primus catalog you can identify as Claypool's:

Slap + tap + fingerstyle hybrid technique. Three or four different attack approaches across single Primus arrangements; the right-hand vocabulary is the defining modern-bass-virtuoso template.
Lead-bass inside experimental-rock contexts. Primus songs are often built around Claypool's bass as the primary melodic voice; vocals + guitar + drums orient around the bass.
Cross-genre flexibility. Funk-rock + progressive-rock + experimental + metal-adjacent + bluegrass + spoken-word all anchored by Claypool's bass; Primus's catalog is one of the most genre-promiscuous in modern rock.

Bandmates on CYS. Profiles for Larry "Ler" LaLonde + Tim "Herb" Alexander + Jay Lane (Primus's various drummer + guitarist personnel) pending. Stewart Copeland (Oysterhead).

Bassist hub. All bassists on CYS. Tier A virtuoso bass canon parallel: Jaco Pastorius (Weather Report), Marcus Miller. Profiles for Victor Wooten + Stuart Hamm + Billy Sheehan pending.

Frequently asked questions

What strings does Les Claypool play?

Documented La Bella Strings signature artist. La Bella's roster lists Claypool, and his preferred string set has been documented across multiple Bass Player magazine + Premier Guitar features. The combination of La Bella strings + Carl Thompson basses produces the canonical Claypool tone across the Primus catalog.

What basses does Claypool play?

Carl Thompson Custom basses primarily. Carl Thompson is a Brooklyn-based custom luthier who has built Claypool's signature instruments including the canonical 4-string Rainbow Bass + 6-string Pachyderm bass + multiple Carl Thompson 5-string + fretless instruments. The relationship is one of the longest custom-luthier collaborations in modern rock; Carl Thompson basses are the defining Claypool instrument. The Pachyderm 6-string is the most-photographed Claypool bass + has been featured in countless Bass Player features.

What's Claypool's playing style?

Defining cross-genre bass-virtuoso vocabulary. Three identifiable signatures: (1) Slap-bass + tap-bass + fingerstyle hybrid technique that switches mid-song; Claypool's right hand uses three or four different attack approaches across single Primus arrangements. (2) Lead-bass vocabulary inside experimental-rock contexts; Primus songs are often built around Claypool's bass parts as the primary melodic voice (vocals + guitar + drums orient around the bass). (3) Cross-genre flexibility: Primus's catalog spans funk-rock + progressive-rock + experimental + metal-adjacent + bluegrass + spoken-word, all anchored by Claypool's bass.

Did Claypool audition for Metallica?

Yes. Claypool auditioned for Metallica in 1986 after Cliff Burton's death; Metallica passed because they felt his playing was too distinctive for the band. The audition is widely cited in Primus + Metallica history. James Hetfield reportedly told Claypool he was too good for Metallica + should keep his own band; Primus broke through internationally three years later with Frizzle Fry (1990). The audition is one of the most-cited what-if moments in metal history.

What's Oysterhead?

The 2000-2001 supergroup with Trey Anastasio (Phish) + Stewart Copeland (The Police, drummer). The Grand Pecking Order (2001) is the band's only studio record. The band reunited briefly in 2006 + again for a 2020 livestream during the pandemic. The Oysterhead lineup is one of the most-documented modern rock supergroups.

Did Claypool compose the South Park theme?

Yes. Claypool wrote + recorded the South Park animated TV theme that has aired since 1997. The theme features a distinctive bass + banjo + chant arrangement that became part of the show's identity across nearly three decades of broadcasting. Claypool's composer credits extend across multiple film + TV projects beyond Primus.

Who Les Claypool is

Style signatures

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