Question: Friðrik Karlsson is an Icelandic musician and songwriter who contributed to the soundtrack of musical with a book by Nan Knighton and music and lyrics by who?
Sentence (from "Friðrik Karlsson"): He studied classical and jazz/rock guitar and had success with the group Mezzoforte in 1983 with the U.K. top 20 hit, "Garden Party".
Relevant evidence: No