CITY OF ANGELS. It's one of the most neglected Best Musical Tony winners ever. The book could use a little tinkering (especially the ending) but it's almost there.
CAMELOT has a wonderful score, but that book needs some serious pruning--plus the staging would have to be SPECTACULAR. I've always kind of resented the fact that this musical, which should have been a perfect choice for screen adaptation, was filmed so lifelessly. I have the exact same complaint about CAROUSEL.
I ask in all honesty/What would life be?/Without a song and a dance, what are we?/So I say "Thank you for the music/For giving it to me."