The first Primus album to achieve much widespread airplay (thanks to its release on a major), and the one that broke them on MTV, Sailing the Seas of Cheese completely redefined the possibilities of the electric bass in rock music for those who'd never heard the group before.

Slapping like a funk player, but strumming power chords and finger-tapping like a metal guitar hero, Les Claypool coaxed sounds from his instrument that had rarely if ever been made the focus of a rock band.

Claypool's riffs were so full and dominant that they hardly needed to be doubled by guitarist Larry LaLonde (and wouldn't have had the same effect anyway), which freed him up on most songs to launch into dissonant, atonal solos that essentially functioned as texture, complementing Claypool's oddly whimsical sense of melody.

The combination results in a weird atmosphere that could be transformed into something dark or eerie, but Claypool's thin, nasal voice and demented blue-collar persona place the record firmly in the realm of the cheerfully bizarre.

The compositions are mostly riff-driven, fleshing out their heavy metal roots with prog rock tricks from Rush and Frank Zappa, as well as the novelty side of Zappa's sense of humor.

The willful goofiness may alienate some listeners, but it can also obscure some genuinely dark humor, and it never detracts from the band's frequently stunning musicianship.

Somewhat analogous to jazz trumpeter Dizzy Gillespie, Claypool hasn't inspired many direct imitators because of his tremendous feats of dexterity.

But his stature as a virtuoso able to take his instrument into previously undreamed-of realms is without question.

Though Sailing the Seas of Cheese tones down Primus' penchant for jamming, it's the tightest, most song-oriented representation of their jaw-dropping, one-of-a-kind style.