Hey! Here's the post about openmic which includes all the rules you need to follow for your entry to be valid.

https://steemit.com/openmic/@luzcypher/steemit-open-mic-41-record-your-performance-on-your-phone-enter-and-win-steem-sponsored-by-pfunk-and-luzcypher

It's good fun and there's the possibility to win some Steem too. Other than that just try posting some links to your music and see what happens