This Weekend’s Concerts, From Justin Bieber to Frankie Valli

This wasn't the only important live-music event of the weekend, luckily. In today's concert roundup, photos of shows from Bear in Heaven, Free Energy, A-Ha, Justin Bieber, Frankie Valli, Adam Lambert, The Walkmen, Katy Perry, Rihanna, and Black Eyed Peas. Click through, and enjoy.