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.
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.
Fav musical? Hard to pick but it would be a tie between Into the Woods and Memphis: The Musical. So many others I love though!
Fav play? Romeo and Juliet.
Phantom of the Opera!
That's really tough. I love Hair and I adore Thoroughly Modern Millie.
For a non-musical, maybe Buried Child by Sam Shepard. It is so wonderfully twisted. I also like Jean Genet's work. I'm into classical Greek plays as well.