In 1966 Holder appeared with The BBC Radio Orchestra and in 1972, he was one of the winners of the Castlebar Song Contest, for the folk ballad "Song for Jenny", composed by Sheila Roberts.
In 1966 Holder appeared with The BBC Radio Orchestra and in 1967 Holder recorded with John Dankworth a project that featured the actress singer Nadia Cattouse. In 1972, Holder was one of the winners of the Castlebar Song Contest, for the folk ballad "Song for Jenny", composed by Sheila Roberts.