During the early- and mid-'70s, Wishbone Ash were among England's most popular hard rock acts. The group's roots dated to the summer of 1966, when drummer Steve Upton formed a band called Empty Vessels with bassist/vocalist Martin Turner and guitarist Glen Turner. Empty Vessels soon changed their name to Tanglewood and moved to London; during a gig at the Country Club in Hampstead, they were seen by would-be rock manager Miles Copeland, who was impressed with the jazz and progressive rock influences within the band and offered to be their manager.
Glen Turner left the band at...