Barbara Gracey Thompson MBE was an English jazz saxophonist, flautist and composer. She studied clarinet, flute, piano and classical composition at the Royal College of Music, but the music of Duke Ellington and John Coltrane made her shift her interests to jazz and saxophone. She was married to drummer Jon Hiseman of Colosseum from 1967 until his death in 2018.

Philip John Albert "Jon" Hiseman was an English drummer, recording engineer, record producer, and music publisher. He played with the Graham Bond Organisation, with John Mayall & the Bluesbreakers and later formed what has been described as the "seminal" jazz rock/progressive rock band, Colosseum. He later formed Colosseum II in 1975.