Copyright 1991 Times Newspapers Limited The Times July 29, 1991, Monday SECTION: Features LENGTH: 342 words HEADLINE: Jellyfish BYLINE: David Toop BODY: Jellyfish, Town & Country JELLYFISH present a serious problem to any critic who is older than ten. How can one write about the band without banging on about their influences? This four-piece from San Francisco is clearly brimming over with songwriting skill, instrumental ability, charm and panache. But are they the Beatles, the Monkees, the Partridge Family or Jellyfish? Although these thoughts were not stilled totally by the live show, at least there were sufficient novelties and distractions to limit the annoying mental games of name-that-tune. Keyboards, guitar, drums and bass were ranged across the platform in a stra ight line and drummer Andy Sturmer played standing up. Also surprising, in these days of rigid beats and mechanical playing, were the numerous tempo changes, pauses and varied time signatures. At one point, Sturmer even abandoned the group for a moment to pursue a young woman who had jumped on stage. All thr ee of these incidents were reminiscent of another era. The elements which make up a Jellyfish song are also suggestive of the past, not to mention stolen from it. ''Calling Sarah'' was typical in evoking the eroded memory of an early Seventies pop hit. Like virtually everything Jellyfish played, this was an original based heavily on a composite of late Beatles and other groups from the sunset of psychedelia. ''The King Is Half-Undressed'' sounded quintessentially Sixties, with its snaredrum hammering on the fours under summary vocal harmonies, while ''Baby's Coming Back'' could have been Herman's Hermits. This is the sort of song that causes wild dancing and hand-waving at live shows. The fans obliged to such an extent that I might have predicted a hugely successful future for Jellyfish, were this 1981. The music business has become too fragmentary and wayward for that, however. A cover version of ''Jet'', from the third Wings album, was a perfect example of the melodic pop they were striving to equal. For the audience they succeeded, but for the critic the problems of pastiche linger.