What makes Upon Reflection by John Surman notable?

'Upon Reflection' is significant for its innovative blend of jazz and experimental elements, contributing to the progressive jazz movement of the late 1970s. The album received critical acclaim for its adventurous compositions, influencing contemporaries and earning a place in discussions about the expansion of jazz boundaries during this era. Released in 1979, 'Upon Reflection' marks John Surman's fifth studio album, showcasing his evolution as a prominent figure in the UK jazz scene. Following his acclaimed works in the early 1970s, this album represents a deeper exploration into avant-garde structures and orchestration, further solidifying his unique voice within jazz and experimental music.