Sinfield worked as an artistic director, roadie, and technical handyman for the prog greats, then enjoyed a long career as a lyricist for other artists

Peter Sinfield, a versatile lyricist who cofounded prog-rock icons King Crimson and contributed to songs by Emerson, Lake & Palmer and Cher, has died.

Doug Ingle, lead vocalist, organist and primary composer of the band Iron Butterfly, died in late May at the age of 78. Iron Butterfly was founded in 1966, they released their debut album in 1968 and within six months were prog rock stars.