This edition of our monthly Pop Roundup serves two purposes. First, as always, it's your exclusive guide to the hottest new pop albums the big ones you know, but also the up-and-comers you just haven't fallen in love with yet. But this particular dispatch is also a great showcase of the breadth encompassed under that ambiguous umbrella (that's right: ambiguous umbrella) we call "pop." We've got everything from Joss Stone's increasingly blues-soaked soul-pop to The Summer Set's Bieber-meets-emo pop-rock, from Vanessa Carlton's new '70s-spun opus to dance-pop princesses like Kelly Rowland, Selena Gomez and, well, Pitbull. And, of course, there's Queen Bey.