[6] In 1988, Warner-Chappell acquired Birch Tree Group (formerly Summy Birchard),[7] publisher of Happy Birthday to You, and the Frances Clark piano method books.

[8][9] In 1990, Warner Chappell acquired Mighty Three Music, the publishing company of Thom Bell and Gamble and Huff.

[16] In November 2006, Disney Music Publishing and Warner Chappell agreed to a licensing agreement for Europe and South America major markets.

[20] In 2011, it acquired Southside Independent Music Publishing, whose songwriters included Bruno Mars, Brody Brown, and J.R.

[30][31] In May 2019, Warner Chappell Music was again criticized for filing overly broad copyright claims, concerning a large number of YouTube videos by Minecraft Youtuber Mumbo Jumbo, who has more than 8 million subscribers, for the sole reason that the intro song on all of them contained samples of a song that was copyrighted by Warner Chappell Music.

He stated that he intended to dispute Warner Chappell Music's claims, but that their large number (around 1800) would make this burdensome.

[34] On January 3, 2022, Variety reported that the estate of English musician David Bowie had sold the late artist's publishing catalog to Warner Chappell Music, "for a price upwards of $250 million".