Rolling Loud (Dec. 16-17 in San Bernardino), with its global tour model, is one of a growing wave of hip-hop festivals. How streaming is helping a genre traditionally shunted into expensive clubs ...

Not only does “SexyBack” bring pop and hip-hop to the forefront, but he also meshes dance and a little bit of disco to it. 17 of 20 “Dark Horse” by Katy Perry feat.