Singer, bassist, and songwriter Glenn Hughes is a living, breathing embodiment of British rock, and his is a compelling story. Starting out in the 60s with beat combo Finders Keepers, he formed acclaimed funk-rock band Trapeze, then joined Deep Purple at their commercial peak. Flying around the world in the band's own jet, Hughes enthusiastically embraced the rock 'n' roll lifestyle. He played on three Purple albums, including the classic Burn. When...