The crossword solution for the term 'Complete Set in Musical Comedy' is VOWELS, which stands for the six letters A, E, I, O, U, and sometimes Y. This phrase is often used to refer to the characters in a musical comedy, as they are typically the ones who sing and dance throughout the show. The phrase 'Complete Set in Musical Comedy' is a reference to the fact that all of the characters in a musical comedy must be present in order for the show to be complete.