"What Is Life" was included on the 1976 compilation The Best of George Harrison as well as 2009's Let It Roll: Songs by George Harrison [REF].
An alternative studio version of "What Is Life" - in fact, a rough mix of the original backing track with different orchestration (in this case, piccolo trumpet and oboe)[REF] - was issued as one of five bonus tracks on the 2001 remaster of All Things Must Pass [REF].