"Lush Life" half the score of La Cage, Hedwig and Falsettos look at Rufus Wainwright's songs, especially "Poses" Charles Aznavour, "What Makes A Man?" and many songs by Cole Porter, Noel Coward (Mad About the Boy, If Love Were All!) and Larry Hart, although they weren't first performed that way and aren't explicitly about being gay (neither is Strayhorn's "Lush Life" btw, although it like "If Love Were All" is frequently seen as an autobiographical lyric by a gay lyricist)