The 17th annual concert began at 11:30 AM with the cast of current and upcoming shows performing numbers backed by a 30-piece orchestra.

Among those in attendance were cast members of Avenue Q, Billy Elliot, Chicago, The Little Mermaid, Grease, Gypsy, Hairspray, In the Heights, Irving Berlin's White Christmas, Jersey Boys, The Lion King, Legally Blonde, Mamma Mia!, Mary Poppins, Monty Python's Spamalot, The Phantom of the Opera, Pure Country, Spring Awakening, A Tale of Two Cities, 13, [title of show], Wicked, Xanadu and Young Frankenstein.

Here is a look at the event:

Jason Robert Brown (center) with the cast of his 13

Gypsy's Lenora Nemetz, Lisa Rohinsky, Marilyn Caskey and Alison Fraser

Legally Blonde's Bailey Hanks		Little Mermaid's Sierra Boggess

Xanadu's Kerry Butler		Xanadu's Mary Testa and Jackie Hoffman

Carolee Carmello (center) and Mamma Mia! cast

Mary Poppins' Ashley Brown and Legally Blonde's Matthew Risch		Xanadu's Cheyenne Jackson and Chicago's Tom Wopat

Avenue Q's Carey Andersen, Christy Carlson Romano and Christian Anderson		Xanadu's Tony Roberts

The guys of Grease

The cast of White Christmas

All photos by Aubrey Reuben.

To view more photos, click here.