R/GA is sponsoring a contest on the Behance Network for imagining the future design of the “mobile music experience.” They encourage all creative professionals to “submit projects that represent how you think we’ll use mobile devices to experience music in the future, and we’ll award one lucky winner $2500.”
The rules? None. Just make something. Or submit something you’ve done in the past (there is no “client,” it is just a creative challenge). Just stick to mobile + music. And make sure it’s cool.