this information is from the tune-core site:
The TuneCore Philosophy
TuneCore believes all artists, from emerging to established, should have affordable and equal access to all channels of music distribution. When you use TuneCore Music Distribution, you keep 100% of your sales revenue without giving up any of your master recording ownership, copyrights, and merchandise rights. TuneCore Music Publishing Administration licenses and registers your compositions globally and helps you collect the royalties that you’ve earned.
At TuneCore, we like to keep things simple and transparent. We are all about getting your music heard and bought so you can get paid; we want you to make a living doing what you love.