In 1975, Martin and Coulter were joint recipients of an Ivor Novello Award for 'Songwriter of the Year'. The Bay City Rollers had a No. 1 hit in 1976 in the US "Billboard" Hot 100 chart with "Saturday Night", a song that was not released as a single in the UK. There were three No. 1 hits in the US for the songwriters, the other two (which were chart-toppers on the "Billboard" Hot Country Songs and the Adult Contemporary listings respectively) being "Thanks", performed by Bill Anderson and "My Boy", sung by Elvis Presley. They also contributed incidental music to the 1967 "Spider-Man" television series, and Coulter also wrote the score to the 1978 film version of "The Water Babies". As well as writing hit singles, Coulter produced three albums with Planxty. Christy Moore wrote: "With no competition he gave us a shite contract and we signed everything away. All that said, 30 years on this album sounds good. He produced it well and ... (he had) the foresight and wherewithal to record the band at a time when no one else was listening. Coulter produced, arranged and wrote most of Joe Dolan's 1983 album, "Here and Now". The album featured several hit singles, including the Irish Top Ten hit "Deeper and Deeper" which remained a staple in Dolan's live sets, and was also one of the last songs Dolan performed before he became ill on stage, during what turned out to be his last ever show in Abbeyleix. The album was released in South Africa as "Yours Faithfully" where it went to number one within one week of release. In 2007, Coulter joined with Sharon Browne, one of the originators of the successful Celtic Woman production, to collaborate on formation of a male version of that production called Celtic Thunder. A stage production at The Helix in Dublin was released on DVD as "Celtic Thunder: The Show", and it went to the top of the Amazon and Billboard Top World Albums chart in 2008. Many of the tracks in the show, such as "That's a Woman" and "Heartbreaker", were written by Coulter. Coulter resigned from his position in 2011. In 1984 Coulter launched himself as an artist in his own right and began by releasing a solo instrumental album called "Classic Tranquility". His follow-up, "Sea of Tranquility", became the second-best selling album of all time in Ireland.