Active from the mid 1960s, godfathers of the British underground psychedelic-folk movement the Incredible String Band mixed folk, Eastern influences, psychedelia, and a loopy, mythology-laced sense of humor. Long time associates of famed folk-rock producer Joe Boyd, the ISB evolved from a trio down to a duo (Robin Williamson and Mike Heron combining to make what is arguably their most successful incarnation) and later expanded to a full band. They sputtered out in the mid 1970s; however, Heron, Williamson, and assorted backing musicians re-formed to play several scattershot reunion shows in the late 1990s/early 2000s.