Beyonce stopped by City Hall Park in NYC yesterday for J&R's MusicFest concert series, but she wasn't there to take the stage. Instead, she was out and looking happy to play fan for a change watching performances from sister Solange and Destiny's Child's Michelle Williams. While it's been a bit since we've had a new Beyonce single to sing along with, you can check out her Stand Up to Cancer collaboration track, "Just Stand Up," [1] with all the rest of those fabulous women after the jump. The song is available for purchase on iTunes starting September 2 and with a roster of famous voices like that it's sure to do some great things for the wonderful cause.

[1]

To listen to the track from Beyonce, Mariah, Rihanna, Carrie Underwood and many others just

Source [2] and Source [3]