This is an elliptical way of indicating that a guy has homosexual tendencies; not that there is anything wrong with that. Used in Pacfic Northwest. Most straight males abhor musicals.
Megan: "Do you think Thurmond is interested in me?"
Clarissa: Let's just say that he likes show tunes.
Clarissa: Let's just say that he likes show tunes.
by Big Sky Heidi September 15, 2010