Usually music blogs do inform about music, but the following services are using the flexibel blog format to provide music downloads and this with a great choice of music.
The first blog is thedownplayer.com and the idea of the service simple. A team is searching for free music on the internet and arranges the music within the blog including download links. Furthermore the service is open for contacts to promote music and for advertisers. By the integration with various social networks there are a couple of ways to stay informed about updates and new music downloads.
A step further is the approach of RCRD LBL. This blog is focussing on music trends with the music introduced within the site including downloads. There are about 25000 singles available by the site including some exclusive recordings and rarities. Too musicians are able to contact the service for the purpose of getting their stuff promoted.