He was performing in Sunday afternoon pop shows at Melbourne's Festival Hall at the age of 14 and at 16 he was signed to a record contract with Ivan Dayman's Sunshine label (whose roster included top singers such as Normie Rowe and Tony Worsley).
From 1965 to 1967, he released ten 45 records in Australia, of which seven made the Top 40, the most successful of which were a cover of Conway Twitty's Speechless (The Pick Up), and a rousing version of Solomon Burke's Stupidity.
As well as sharing vocals in The New Seekers he was a talented songwriter and contributed many songs to their albums which included ballads such as "I Can Say You're Beautiful" and "Lay Me Down" and more up-tempo numbers like "Boom Town" and "Cincinnati".
He continued working in the UK until 1981, during which period he issued five solo singles, including a cover of The Easybeats "Friday on My Mind", and one album, Skin Deep.
By 1976, with the backing of David Mackay, Peter had secured a recording with RCA and his first single, released on 13 August 1976, was a version of the Easybeats' Friday on My Mind.
His album, also entitled Skin Deep, released in 1977, included a variety of musical styles and six songs penned by Peter, but this too failed to provide him with solo success.
This song, ironically, had also been covered two years earlier by The New Seekers with Peter Doyle's replacement, Danny Finn, on lead vocal.