1 Spectrum Is A New Beat/techno Duo Of David Morley And Renaat Vandepapeliere From The Final '80s - Early '90s. 2 Spectrum Is An Australian Progressive Rock Band That Formed In Melbourne In 1969 And In Its Original Period Remained In Existence Until 1973. Its Members Also Performed Under The Alter-Ego Indelible Murtceps. They Reformed Initially As Spectrum Plays The Blues In 1999. Mike Rudd - Vocals Guitar Harmonica Bill Putt - Bass Mark Kennedy - Drums Ray Arnott - Drums Peter 'Robbo' Robertson - Drums Percussion Lee Neale - Keyboards John Mills - Keyboards Daryl Roberts - Keyboards 3 Spectrum - A British Band That Was Founded By Peter Kember Ex-Spacemen 3 In 1991