What's a good musical for a wannabe Broadway expert to listen to?

Question:

What's a good musical for a wannabe Broadway expert to listen to?

I have limited experience with musicals, and I would like to expand my knowledge. What musicals would be good for me to begin with?

Additional Details

6 months ago
I have been in a few musicals: Godspell, Annie Get Your Gun, and The King and I. I have seen Beauty and the Beast and Chicago (live). What else is good?

Best Answer - Chosen by Asker: 6 months ago
I have been in a few musicals: Godspell, Annie Get Your Gun, and The King and I. I have seen Beauty and the Beast and Chicago (live). What else is good?