Spectrum is an Australian progressive rock band which formed in April 1969 and broke up in April 1973. The original line-up was Mark Kennedy on drums, Lee Neale on organ (ex-Nineteen87), Bill Putt on bass guitar (ex-Lost Souls), and Mike Rudd on guitar and lead vocals (ex-Chants R&B, The Party Machine). In August 1970 Kennedy was replaced by Ray Arnott on drums. These members also performed under the alter ego, Indelible Murtceps, from 1971 to 1973. Spectrum had a number-one hit, “I’ll Be Gone” (January 1971), on the Go-Set National Top 60 singles chart.
“I’ll Be Gone” or “Some Day I’ll Have Money” is a song by Australian progressive rock group Spectrum released as their debut single by EMI on Harvest Records in January 1971. It peaked at #1 on the national singles chart, while it reached Top 5 in Melbourne, Sydney and Brisbane. The song was written by guitarist and vocalist Mike Rudd, and produced by Howard Gable. The B-side, “Launching Place Part Two” was written to promote a music festival. Spectrum never repeated the success of “I’ll Be Gone”