Sid Rumpo were an Australian R'n'B group which formed in Perth in November 1971. They issued their debut album, First Offense, in April 1974 on Mushroom Records/Festival Records but disbanded by the end of that year. The band were formed by John Hood on lead guitar and harmonica (ex-Jelly Roll Bakers, Juke); Noel Herridge on drums (Adderley Smith Blues Band); Owen Hughes on bass guitar (Jelly Roll Bakers); Robert Searls on lead guitar and vocals; and Ken Wallace on piano. In 1972 they won the Western Australian state final in the Hoadley's Battle of the Sounds.
They appeared at both the 1973 and 1974 Sunbury Pop Festivals. According to Australian musicologist, Ian McFarlane, "one of the unique features of the band's sound was the use of dual, harmony guitar lines which had the effect of enhancing the natural spaciousness of the music. To top it off, Searls was one of the great gravel-throated blues wailers of the day".