One of my favorite J-Rock groups is Scandal, who started out as four actresses in training. Each was advised to learn a musical instrument to round out their skill set; so they chose 4 different ones and formed a kick-ass band. You mostly only hear them in North America on Anime DVDs, when they come through on tour, or periodically on a J-Melo broadcast. And while over here they are best known for their contributions to K-ON and other anime, they have a ton of top quality non-anime music as well, and more fans than you might suspect (some of whom can sing their entire catalog in Japanese). Did I mention the have won some awards, including the Viewers Choice Awards on J-Melo?