If you have access to certain music-focused private torrent trackers, many will do spotlight articles on independent or smaller artists who are also members.
This kind of sharing is often welcomed and a valued thing, so could even be a way in to some of those communities.
Redacted does this, and I've been introduced to some really good music this way.
Alternately, as others have noted, Bandcamp is a good way to offer as well. If you go this route, even with setting the music as free, you might make some small money... I've often tipped a bit via the "Pay what you want" pricing tier.
