The best new blog I've followed in many months is the blog for the music streaming service Rdio. I've been a paid member of Rdio since they launched, but I only occasionally use the service, since most of my music playing is in the car where controlling it via an iPhone app is problematic (for safety reasons, I'd rather use my car's integrated steering controls to advance songs).
Then I found their blog. Every Tuesday, new music that is one click away to play, plus posts on the best music of the previous month in case you missed them, and plenty of posts about exclusive new albums (also freely playable in just a click). If you're a user of Rdio, by all means sign up for their blog, in the few weeks I've followed it I've fell in love with three albums I wouldn't otherwise have known were even released.