KYKLOS, an algorithmic composition program, is presented here. It
generalises musical scales for use in composition as well as in
performance. The sonic output of the system is referred to as
polymodal music since it consists of four independent voices
playing ‘synthetic modes’. KYKLOS is suitable for
computer-assisted composition because it generates MIDI files which can be
altered later by the composer. It can equally well be used in live
performance for dynamic modification of parameters enabling realtime
musical control.