Sylvia (Focus song) on the "Old Grey Whistle Test", along with a number of UK gigs in late 1972, has been crediting with exposing the band and helping the single reach number 4 in the UK Singles Chart. The programme's presenter, Bob Harris, is quoted as saying that the band's appearance was so well received by the audience that the pressing plant for the single was overwhelmed and only produced copies of "Sylvia" for the following week to cater for the demand. Dave Thompson, writing for AllMusic, said that aside from the studio recording, the band's best version of the song was the
Bob Harris (radio) "The Old Grey Whistle Test" rock music show on BBC television from 1972 until December 1979. His first appearance on the show was as chair of a debate on the Night Assemblies Bill, based on his experience as a journalist and at the invitation of producer Richard Williams. Shortly afterwards he was invited to be the main presenter. His velvety voice and quiet delivery earned him his enduring nickname. His hippie-style beard and laid-back presentation made him a favourite target for parody, most notably by Eric Idle on the 1970s BBC comedy show "Rutland Weekend Television". Harris later became notorious