User blog comment:EmpyrealInvective/Koromo and Empy's Song Competition/@comment-25975226-20150524130903/@comment-25428589-20150525075239

"Once the song has been assigned (from a pre-determined list Koromo and I have compiled), participants will have one week to submit a story that meets quality standards and is not a blacklisted subject or spinoff."

Quoting from the rules above.