My favorite show is probably Amadeus. It's amazing. (My high school Drama teacher got to see a production of it with Mark Hamill as Mozart. Luke Skywalker as Mozart. Oh yeah.)
Ooh, or American Idiot. Because it's amazing.
Musical: Falsettos. (I'd rather say the Marvin Songs Trilogy because I don't like to leave out In Trousers, but Falsettos is more recognizable.) And I also have to mention [title of show] because it hold the warmest place in my heart.
Play: My favorite play is hard for me to narrow down, its always changing. I'm currently taking particular interest in the 39 Steps and War Horse.
Wicked, Into The Woods, Les Miserables and Chicago
I must have seen each of them at least 4 times
Either Wicked or AVPM and AVPS!
(Malfoy, you little Poofer!)
EDIT: Oh, and Chicago too.
OMFG, there are just too many!!! XD
Musical: oh my goodness, so many. Either Jersey Boys, Singing in the rain or the lion king.