Well, I'm an actor-type fella, so I've been in my share of musicals. Here are some of the ones I've been in, and the roles I played:
Cabaret - Cliff Bradshaw
How To Succeed In Business Without Really Trying - J. Pierepont Finch
Guys & Dolls - Nathan Detroit
You're a Good Man Charlie Brown - Schroeder
Anything Goes - Sir Evelyn Oakleigh
Bye Bye Birdie - Albert Peterson
Hair - Claude
I do my share of "straight" plays and musicals. The last show I was in (to date) this past fall was Journey's End, definitely NOT a musical (!) set during WWI. I played Captain Dennis Stanhope, a bitter soldier who drinks heavily to control his nerves and maintain his sanity. A revival of the show just opened on Broadway.
Back on topic...
Here are some of the musicals I like, but haven't been in:
Chicago
The Rocky Horror Show
Little Shop of Horrors
Oklahoma!
Sweeney Todd