 He was a founding member of 1960s pop group The Fourmyula and later formed Rockinghorse and The Warratahs before embarking on a solo career in 1994.Mason wrote a series of hit singles with Ali Richardson for The Fourmyula; his best known song is "Nature", which in 2001 was voted No.1 in a list of the Top 100 New Zealand Songs of All Time.The song, which Mason re-recorded on his 2001 album "Same Boy", has also been covered by The Mutton Birds and Margaret Urlich.