When I think of a catchy score, I tend to think of one that gets my head bobbing a long when I listen to it. So, I don't think of score that have sweep to them as being catchy. Shows like "Phantom" or "Sunday"
Yes, there are a lot of shows here previously mentioned that I would agree do get my head bobbing along as I listen to them. But the first title that leaped to my mind is one from is my beloved flop Kander and Ebb jem, "70, Girls, 70." Why more critics didn't fall over themselves praising that score at the "Encores" revival, I don't know. (Olympia Dukakis couldn't have been that bad, could she?)
And being a great lover of flop musical, the next title that came to my mind was the '50's flop "Whoop-Up!" by Moose Charlap
"A coherent existance after so many years of muddle" - Desiree' Armfelt, A Little Night Music
"Life keeps happening everyday, Say Yes" - 70, Girls, 70
"Life is what you do while you're waiting to die" - Zorba