| http://www.w3.org/ns/prov#value | - Eventually, he fell into producing and writing songs for some of the biggest acts today, including Katy Perry, Taylor Swift and motorcycle buddy P!nk.Butch Walker talks about the evolution of the music industry in this exclusive clip from his documentary, Out of Focus:When asked how he started producing other artists, Walker gushed, Prince was one of my favorite artists of all time growing up and
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