Warner Music Group (WMG) is the third-largest of the "big four" major record labels, the others being Sony BMG, EMI, and Universal.

Warner Music Group also has a publishing arm, Warner/Chappell Music, which dates back to 1929, when Jack Warner, president of Warner Bros. Pictures Inc., founded Music Publishers Holding Company (“MPHC”) to acquire music copyrights as a means of providing inexpensive music for films. Amongst the historic compositions in which the publishing rights are controlled by WMG are the works of Cole Porter, Richard Rodgers and Lorenz Hart. Its printed music operation, Warner Bros. Publications, was sold to Alfred Publishing on 2005-06-01.