Do you want just shows currently running and just musicals?
Because any discussion of how theatre interprets the American Dream is incomplete without including DEATH OF A SALESMAN.
Then of course there is Albee's THE AMERICAN DREAM. Tennesee William's THE GLASS MENAGERIE would be interesting to compare and contrast with SALESMAN, though I'm sure that's been done many times before.
As far as musicals go, one of the best examinations of the dark side of the American Dream has to be ASSASSINS.
"One no longer loves one's insight enough once one communicates it."
The opposite of creation isn't war, it's stagnation.