Online Music Distribution, such as the defunct Mp3.com.
these are unvetted sites, no restriction on quality.
if you have a computer, can upload a tune, you have a shot at charting.
most force free downloads to be available on the artist's pages.
they're great for when you're starting out, in need of feedback
or a confidence/ego boost. there's over 3000 of them, the largest
is probably
www.soundclick.com .
kirk