For the first quarter of 2010, and for the second quarter running, Sony/ATV Music Publishing claimed the No. 1 market share based on the 100 most-played songs on the radio, according to Nielsen BDS figures for the three months ended March 31.According to the report published in Billboard, Sony controlled 19.5% of the marketplace, based on radio play from 1,504 radio stations in the U.S. The figure is a considerable improvement over Sony’s tally from the same time period in 2009, when the company notched 16.9%, and reps an 11 percentage point bump above its overall performance in 2006. Leading the charge for the publisher were top 10 hits by Lady Gaga (“Bad Romance”), who was the quarter’s top songwriter, and David Guetta (“Sexy Chick”). The publisher also reps Taylor Swift, the quarter’s No. 2 tunesmith. Sony also finished atop Billboard’s top 10 country publishers chart with a 14.7 share. EMI Publishing finished second for the period with 18.9%, a boost from its 17.7% tally from the same period last year, while Warner/Chappell Music (12.5%) and Universal Music Publishing Group (12.3%) finished third and fourth, respectively. In Billboard’s survey, Sony/ATV — a joint venture between Sony and trusts formed by the late Michael Jackson — controlled 34 of the top 100 airplay songs. The venture has more than doubled its market share in just three years. “We have such a great feeling of momentum right now, and it’s a remarkable accomplishment to rank first for two successive quarters,” Martin Bandier, chairman-CEO of Sony/ATV, said in a statement. “That success is a direct result of our team’s hard work.” According to the music trade, the Harry Fox Agency in New York determines the publishers’ split for each track to calculate their share of the songs.