OK.. well, just scraping off the top of my head, I come up with.. Cabaret, Rocky Horror Picture Show, Sweeney Todd (1982 version.)
But then, it's late and I'm tired, and since pretty much all my choices have always depended on my mood at the time...
Like, if you were to ask me tomorrow, it wouldn't surprise me if I answered, Sound of Music, Calamity Jane, any Judy Garland/ Mickey Rooney film.