Something like this, not necessarily only for music, could be adapted to bitcoin. http://quidmusic.digitalproductions.co.uk/
An artist pledges to release an album once a certain fee is paid. Anyone can contribute towards the release of an album. It appears that the site holds the money and pays on release. The artist chooses the amount.
Using bitcoin would allow anyone to 'audit' and see how much has been paid. Also the address to pay for release could be placed anywhere and fans would not have to have an account at this one site. Not to mention bitcoin is perfect for micropayments anyway considering fees and all.
What is some other content that this model would work well for? I think anything episodic would be great. A carton artist with a reputation for example.