This is what we found on Wikipedia regarding the Gilbert O'Sullivan:

Raymond Edward O'Sullivan (born 1 December 1946), known professionally as Gilbert O'Sullivan, is an Irish singer-songwriter who achieved his most significant success during the early 1970s with hits including "Alone Again (Naturally)", "Clair" and "Get Down". His songs are often marked by his distinctive percussive piano playing style and observational lyrics using word play.

Born in Waterford, Ireland, O'Sullivan settled in Swindon, England, as a child. In 1967, he began pursuing a career in music. Worldwide, he has charted 16 top 40 records, including six No. 1 songs, the first of which was 1970's "Nothing Rhymed". Across his career, he has recorded 19 studio albums. The music magazine Record Mirror voted O'Sullivan the top UK male singer of 1972. He has received three Ivor Novello Awards, including "Songwriter of the Year" in 1973, and received praise from fellow musicians Nina Simone, Paul Weller, Gary Barlow, and Tim Burgess.