I think your record label idea is the most feasible. It would be cool to have a band come from the block chain and get bigger. Doing a monthly music thing would also be cool but it would require you are responsible for getting a certain amount every month.. I paid for someone to build a little free library in their city with steem, and there is steempark that is an awesome project. If I had the funding I would look for something that would stick around and be good advertising, and that's why your last idea is really good. Good luck with you brainstorming. I will give you my humble upvote, to help with your future endeavors!