Barker was a member of Clark Tracey's quintet from 1984 to 1992, and continues to play with Tracey, as well as with Tracey's father Stan. As a sideman he has played with many major musicians and groups, including Ornette Coleman, Carla Bley, Georgie Fame, James Carter, Mike Westbrook, Frank Sinatra, Colin Towns, ABC, The The, Erasure, Chris Botti, Wham!, Alphaville, The Moody Blues, Sting, Bucks Fizz, Mike Oldfield, Cleo Laine, Acoustic Alchemy, and XTC.
He leads his own band, featuring an international mix of musicians – Perico Sambeat (alto saxophone; Spain), Bernardo Sassetti (piano; Portugal), Geoff Gascoyne (bass, United Kingdom), and Gene Calderazzo (drums; United States) – for which Barker also composes.
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