UnScramble this Word: l n k g o i p n?

Questions

Category: Name That Tune: Song title: "What's puzzling you is the nature of my game."?

Category: Name That TuneCategory: Name That Tune: "But the secret is still my own, and my love for you is still unknown..."?

Category: One Hit Wonders: Founding member of Sweeney Todd who went to #1 with "Hot Child In The City"?

Category: One Hit Wonders: Inspired by a classic movie of the same name, it was Bertie Higgins #8 hit?

Category: One Hit Wonders: Nick Hayward's old band who hit in 1982 with "Love Plus One"?