Pasta Primavera is a Baltimore based blog that takes pride in their local talents. They blog about local Indie bands as well as up coming world debut artists. Their music reviews and mp3s are mostly just what they personally find pleasing the ears and hope you will too.
Crappy Indie Musichttp://crappyindiemusic.blogspot.com/
This blog gives endless sounds of local Portland bands. They mean business. Every band they hear they post and review. We like to call it the thrift store of music blogs. If you're a sifter, make sure you stop here.
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!