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To the Australian public at large, Spectrum will always be remembered for the 1971 #1 hit 'I'll Be Gone', an enduring rock classic if ever there was one. As song writer and Spectrum lynchpin Mike Rudd has put it "'I'll Be Gone' has had a marvellous life", with indications that its potency will continue to rise. It still gets played on Australian 'Classic Hits' radio to this day. Spectrum still play the song at practically ever gig with the enthusiastic, sing-along response of the audience inevitable; a perfect example of this was the band's appearance at the 2002 arena rock spectacular Long Way to The Top. The sound of an entire concert audience singing the song's rousing refrain at full voice, with little encouragement, was indeed magnificent.

While the song's appeal is unquestionable, to the dedicated Australian rock music aficionado Spectrum is more than just one gloriously brilliant song. Many fans will tell you that Spectrum music is some of the greatest progressive psych rock recorded in the day, and nominate the band as purveyors of a uniquely Australian sound and identity. Spectrum's debut, Part One was originally released on EMI's progressive label Harvest and is rightfully regarded as not only a landmark progressive rock release, but the beginnings of one of Australia 's more remarkable bands. In its original incarnation (1969-1973), the band went through three different lineups, also gigging extensively under the alter-ego moniker of the Indelible Murtceps, released five albums and five singles, and left behind many fond memories from their concert appearances.