R&B star Toni Braxton is leaving Arista Records to join Blackground Records, Billboard Bulletin has learned. Universal-distributed Blackground has tentative plans to issue a new Braxton album Sept. 16, preceded by the first single in June or July. Braxton's last album, 2002's "More Than a Woman," has sold 375,000 units in the U.S., according to Nielsen SoundScan, compared with more than 2 million copies for 2000's "This Heat."