Cover Lay Downhttp://coverlaydown.com/
Cover Lay Down is a blog dedicated to bringing in more listeners to their favorite genre of music, folk. They do this by finding folk covers of other pupular songs to reel you in and then give what you'll need to keep exploring the fascinating world of folk music.
Music is Free Nowhttp://www.musicisfreenow.blogspot.com/
Cesar Alvarez doesn't give you mp3 downloads or music reviews. Instead he gives you information about how the music industry has changed now that music is free, but also how it has always been free. Very interesting.
We All Want Someone to Shout Forhttp://www.weallwantsomeone.org/
This blog is not completely underground but they do have great alternative tastes. Will Oliver originally built this blog to share music with his friends, but after actually getting a fan base, he turned it into something more legit. Good luck Will!
Indie Music Findshttp://indiemusicfinds.com/
Indie Music Finds is a devout UK blog that is constantly giving new independent music to your ears. They have a mission, and they have not faltered. Their mission is getting you great indie music, and that's exactly what they've done, well.
Atheist Songs highlights the many great songs in the world that have a strong atheist, agnostic, skeptic, freethinker, or pastafarian theme to them. Music showcased on the blog comes from several genres, including rock, pop, and soul.
Swing, Jazz, and Blueshttp://swingjazzblues.blogspot.com/
Blogger Henrik has carved out a well-reputed niche for himself and his blog, both of which are dedicated to getting the word out on the best and most swinging tunes and artists in the blues dance community. Though he's from Scandinavia, Henrik writes as if he grew up in the Latin Quarter of New Orleans. Readers will find their feet tapping spontaneously as they read the jaunty posts on offer here. The perfect bookmark-able blog for real blues fans.