Twenty One Pilots perform Brixton Academy London 2016

Tyler Joseph Twenty One Pilots performs at Brixton Academy on Feb. 24, 2016 in London, England.  

Joseph Okpako/WireImage

In the first quarter of 2016, for the 15th consecutive time, Sony/ATV was the top U.S. publisher -- it even improved its market share to 26.1 percent. But No. 2 Warner/Chappell Music turned in its best performance -- 22.6 percent -- in the 10 years Billboard has been tracking market share for the top 100 radio songs, up more than five points from its 17 percent in Q1.

Warner/Chappell also was the No. 1 country publisher, displacing Sony/ATV from the top spot in that category for the first time since the latter was named administrator for EMI Music Publishing in 2012.

Sony/ATV had a stake in 52 tracks, including a share in the quarter's No. 1 airplay song, Justin Bieber's "Love Yourself" (alongside Universal Music Publishing Group). Warner/Chappell had a share in 47 songs and is the sole top 10 publisher for the No. 2 song, Twenty One Pilots' "Stressed Out."

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UMPG, holding at No. 3, also posted a gain to 16 percent (with 36 songs) from the 14.8 percent it had in the prior quarter. Elsewhere, Kobalt held steady at No. 4 despite its share dropping to 8.8 percent from the previous quarter's 10.6 percent; its top song was Bieber's "Sorry."

This article was originally published in the May 14 issue of Billboard.