Keith Emerson was the keyboard alchemist who made prog rock sound like a classical recital crashed into a rock club. I first caught him in The Nice (1967-1970), where he pushed rock into Bach, jazz, and sheer volume, then he helped launch Emerson, Lake & Palmer (1970-1979; later reunions 1990-1999) and turned the Moog into a headline act. His rig of Hammond, piano, and synths wasn't decoration; it was the whole plot, and he played it like a restless conductor. In the 80s he detoured through Emerson, Lake & Powell (1985-1986) and the trio 3/Emerson, Berry & Palmer (1988-1989), always chasing bigger sounds than the stage could hold, even when the band name changed.