most of the ideas posted by you are revenue models through advertising (where the real value of the user base is not extracted) or with more cumbersome product ecommerce tied with shipping which you don't want to do.
I bet you have these other ideas too - just wanted to point out that if it is an expensive hobby why not keep it as close to heart while making money too:
1. Sell amateur music and published albums of artists on the site.
2. Get musicians collaborate to create a Virtual Learning Environment
3. Let musicians get a private space to blog and evangelize their music to the visitors of the site for a fee. Support reviews, rating etc
4. Let musicians collaborate and organize music tours through the portal.
5. Let fans connect to their favorite musicians - ask questions, get autographs or learn music for a fee
I bet you have these other ideas too - just wanted to point out that if it is an expensive hobby why not keep it as close to heart while making money too:
1. Sell amateur music and published albums of artists on the site.
2. Get musicians collaborate to create a Virtual Learning Environment
3. Let musicians get a private space to blog and evangelize their music to the visitors of the site for a fee. Support reviews, rating etc
4. Let musicians collaborate and organize music tours through the portal.
5. Let fans connect to their favorite musicians - ask questions, get autographs or learn music for a fee
Just some of the ideas to keep it close to music