At clongclongmoo site many netlabels and artists are posting their new free music releases. Free means here you don't have to pay or to login to downlad music. You can usually still pay something to support the artists. Please also note the licenses under which the music is published. This is important to know what you can do with the music. Please visit the home pages of the labels to get the free music. The most of the files are published under a creative commons licence.

Under netlabellist you can find a huge list of websites that offer(ed) free music too.