Reba McEntire's 50 Greatest Hits, a three-CD boxed set, will be released on Oct. 28 by MCA Nashville. Beginning with "How Blue," her first No. 1 for MCA, the collection spans her tenure on the label, concluding with "Because of You," her hit duet with Kelly Clarkson. McEntire and Clarkson plan to tour together again this fall. The boxed set, the first devoted to McEntire, does not reflect her earlier recordings for Mercury Records, which released her first single in 1976.