Bown's first major band was The Herd, along with Peter Frampton. After The Herd dissolved he spent two years with Judas Jump who were the opening act of the Isle of Wight Festival 1970. He played at first for Frampton in the 1970s then switching to bass briefly when Rick Wills departed the Peter Frampton band in early 1975. Bown himself left the Frampton entourage less than a year later, just as Frampton was on the verge of achieving worldwide success. He went back to England where he first dabbled with a solo career (recording two solo albums for Bill Gaff's GM label, US Mercury), then resumed work with Status Quo whom he started playing keyboards for in 1973 as a session musician, including sessions with Jerry Lee Lewis on the London Sessions Album. Andy first appeared on Quo's "Hello!" album in that year; performing on every album by the band from 1977's "Rockin' All Over the World" onwards, and supporting them in concert. He joined Status Quo as a full member in 1982, and has been with them ever since.