There are several bands with the name "Hard Stuff" 1. An English hard rock group formed from Atomic Rooster's John Du Cann and Paul Hammond, and Quatermass's John Gustafson. They recorded two albums, Bulletproof and Bolex Dementia (both on Purple Records). Compared with Atomic Rooster's more progressive leanings, Hard Stuff was based more heavily on aggressive guitar. Sinister Minister, Taken Alive, and Time Gambler are some of their singles off of the album Bulletproof.