The film studio Warner Bros. had no record label division at the time one of its contracted actors, Tab Hunter, scored a No. 1 hit song in 1957 for Dot Records, a division of rival Paramount Pictures. In order to prevent any repetition of its actors recording for rival companies, and to also capitalize on the music business, Warner Bros. Records was created in 1958.^[11][12] In 1963, Warner purchased Reprise Records, which had been founded by Frank Sinatra three years earlier so that he could have more creative control over his recordings.^[13] With the Reprise acquisition, Warner gained the services of Mo Ostin, who was mainly responsible for the success of Warner/Reprise.^[14]

After Warner Bros. was sold to Seven Arts Productions in 1967 (forming Warner Bros.-Seven Arts), it purchased Atlantic Records, founded in 1947 and WMG's oldest label (until WMG completed its acquisition of Parlophone in 2013), as well as its subsidiary Atco Records. This acquisition brought Neil Young into the company fold, initially as a member of Buffalo Springfield. Young became one of Warner's longest-established artists, recording both as a solo artist and with groups under the Warner-owned Atlantic, Atco, and Reprise labels. Young also recorded five albums for Geffen Records during that label's period of Warner distribution. The Geffen catalogue, now owned by Universal Music Group, represents Young's only major recordings not under WMG ownership.