here is the best answer u will ever get. "sold my soul 2 the devil" is an expression that means that someone did something they didn't want 2 do, in order 2 achieve something. it usually isn't meant 2 b taken literally. in her case, she means that she went from gospel singer, which she really wanted 2 do, 2 singing secular music. going form singing gospel 2 singing secular is usually referred 2 selling one's soul 2 the devil, by the gospel music industry. the band, heart, said that they soul their souls..., meaning that they went from singing their own compositions, 2 singing others' compositions. they did it in order 2 have more commercial success. u will notice if u search all over youtube 4 the whole interview where katy perry made that statement, u will never find it. all the available videos r cut short, right after she says that. does it make u wonder y? it's probably cuz the people that upload that interview, want 2 hide the fact that it is being taken out of context in order 2 promote their "ministry", etc. this is not 2 say that she is absolutely innocent. it is only 2 say that u have 2 c the whole picture before u judge someone or a situation. in other words, don't jump 2 conclusions. the purveyors of these type of vids on youtube, including the ones on the illuminati, r vying 4 ur attention & ur money 2 support their "ministries". don't fall 4 it.