Leo first found fame in his home country in 1973 when his single "The Show Must Go On" reached no 2 in the UK single charts. He performed this song dressed as a pierrot clown. He co-wrote a number of his songs, including this song. His singing career went from strength to strength and by the late 1970s he was well known internationally having had hit singles and albums in the USA, Ireland, Sweden, Australia and other countries. A number of hit singles followed in the early 1980s, including "Orchard Road" and "More Than I Can Say" . He returned to the top of the UK singles chart in 2006 with a remix hit of his 1977 single, "Thunder in my Heart ".