There's no evidence that Henry VIII wrote "Greensleeves," which is a belief, not a fact. On his musical talent etc., see the thread: Greensleeves, History of. I'd like to know who first said, or when it was first said, that Henry VIII wrote "Greensleeves," very probably without any evidence in the 20th century. Of course, a definitive collection of Henry VIII's music does not contain "Greensleeves": Music at the Court of Henry VIII [Musica Britannica, vol. XVIII], edited by John Stevens, first published in 1962, revised 1969, and reprinted 1973, 1978. It is "A popular volume of secular pieces, transcribed from the collection known as Henry VIII's Book, that captures the diverse musical life to be sampled at the court of England's most fascinating monarch."