On the other hand, software sequencers were continuously utilized since the 1950s in the context of computer music, including computer-"played" music (software sequencer), computer-"composed" music (music synthesis), and computer "sound generation" (sound synthesis). In June 1951, the first computer music "Colonel Bogey" was played on CSIRAC, Australia's first digital computer. In 1956, Lejaren Hiller at the University of Illinois at Urbana–Champaign wrote one of the earliest programs for computer music composition on ILLIAC, and collaborated on the first piece, "Illiac Suite for String Quartet", with Leonard Issaction.also available in