Never mind the hipsters. There is a compelling reason why pop’s still everyone’s guilty pleasure: it’s that darn infectious. Take the case of Rachel Platten, for example. She edges out Vanessa Carlton by a margin on the singer-songwriter genre by upping the tempo and feel of her offerings, most of them landing her on the soundtracks of various movies and TV series. Nevertheless, the songstress has earned that revered indie cred while keeping her musicality intact.