He was praying that we be kept from worldly influences. If the music doesn't originate in God, it can only have one other source. If anyone loves the world, the love of the Father is not in him. On a personal note, sometimes when I hear music that reflects on my youth, I find myself drawn to it. But then the Holy Spirit quickens my heart to the fact that the music I am hearing is working an allurement that is worldly.
Music plays on our emotions and creates pictures in our minds.
What I'm trying to share is that music is a powerful medium of exchange, but the exchange isn't about money. It's about power and influence. Music can open our hearts to messages that Satan wants to plant. Many Christians don't realize that Satan is a master at using music to accomplish his goals. He is a master musician.