Cycle of Pain

John "JD" DeServio is an American musician who has been the bassist of heavy metal band Black Label Society since 2005. He was also a member of Pride & Glory, a southern rock trio, for a short time in December 1994, and was Black Label Society's original bassist, playing on the tour supporting their debut album, Sonic Brew. DeServio also performed on Michael Romeo's solo albums War of the Worlds, Pt. 1 (2018) and War of the Worlds, Pt. 2 (2022).