What is a good free app for downloading music onto an android?

I recently got the Galaxy S. It's an android device. I've been searching and searching and searching. Both the internet, the market place, and asking people on social networking sites. Nothing or nobody can seem to give me a good answer. I'm looking for a FREE application to download, that also allows me to download FREE music. I'm beginning to get very frustrated, so if anybody has any tips as to what may work better, let me know them too? Thank you guys sooo muchhh!!!(: