 Guns, Dream Theater, Kix, Alice Cooper, Cinderella, Tangier, Heart, Ted Nugent and Demolition Pit, he toured over the years as keyboard player and singer for artist like Rick Springfield, Quiet Riot, the Lou Gramm Band, Cinderella and Foreigner.Purdell, who was splitting his time between the studio and the road at the time of his death, produced Ozzy Osbourne's best-selling album "No More Tears" (1991), where John co-wrote the title song, and he also penned the lyrics to three songs on Osbourne's album "Ozzmosis" (1995).In 1997, Purdell founded the production company Three Wishes Inc with broadcasting executive Bill Flowers and Korean superstar Honey.