Solange Knowles is quickly proving herself to be cooler than her older sister Beyonce.  Solange, as well as Michelle Williams performed at the J&R MusicFest yesterday, with Beyonce looking on in the audience. 

Solange is about to release her debut album Sol-Angel and the Hadley Street Dreams.  She has an updated retro vibe about her; think Amy Winehouse but less dark and no crack. 

Click through the gallery to check Solange, Michelle and Beyonce in action.  Click the video to see her new single "Sandcastle Disco"!