Usher, Ke$ha And More Help Dance Music Go Pop In 2010

But is it here to stay? Our music-industry experts weigh in.By Akshay Bhansali Ke$ha Photo: Andreas Rentz/ Getty Images In 2010, pop princesses, R&B icons and chart-dominating newcomers all danced to the same beat. Not only did dance music go pop, but pop music caught the club-music bug. Between Katy Perry's "Firework," Ke$ha's "We R Who We R," Rihanna's "Only Girl (In the World),"