Heavyshift (sometimes Heavy Shift) is a British acid jazz trio composed of William South (piano) and John Wallace (saxophone), who first met and started gigging together around 1994. [1] [2] They have so far released four albums (The Cocktail Years not officially representing Heavy Shift but rather Wallace/South). Their debut album, Unchain Your Mind, featured the hit single "90 Degrees in the Shade" [3] and went to the Top Five on the new adult contemporary charts and Billboard jazz charts being named "Album of the Year" by Jazz FM. [4]