First time creating a mod and I have ran into a problem. I am trying to add my own great works of music basing on Krajzen's mod...

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...however, after deleting all his mp3 files, pasting my own one for test, and changing the script to work, I thought I was good to go. Well, I wasn't. John Williams, who is the great musician I've been trying to add into the game is in the game, but when I tell him to create great work there is no music, even though I put the file name in correctly. What did I do wrong?