Slice the pie is a great website that pays you to listen to and review music. Currently the minimum per song is $.15 which adds up super fast! After you reach $10 you can cash out to paypal. It's super easy and does not feel like work. I wouldn't consider this to be a full time income, but definitely a good source of extra cash. The best part is that the higher rating you have with them the more you make per track. Plus if you refer friends you get 10% referral earnings as well.