Help! I can't find a story!

I read a story awhile ago and I can't find it. I actually made this accout to try to find it, so sorry if I made this post wrong. The story was first person, about a guy in a band (maybe his name was Dan?) and the band was struggleing. They some how got a demon or genie or something to help them and she agreed to be the band manager. She decided the band needed a girl so she turned the main character.
Sorry for the lack of details, but thats why it is so hard to find. Thanks in advance.