Social music service Last.fm is about to hop from the web onto your local radio station. It's been a long time coming.

CBS, the parent company of Last.fm, has announced that it is going to launch a brand new radio station on CBS Radio HD on October 5th. The broadcast, which will begin to air in New York (102.7 HD2), Los Angeles (93.1 HD2), Chicago (93.1 HD3), and San Francisco (105.3 HD3), will be powered by Last.fm's weekly charts, which are determined by Last.fm "scrobbles" in what amounts to the biggest crowdsourcing experiment to ever hit radio. This is something that CBS has wanted to do ever since it acquired the company for $280 million, and it makes complete sense. The flagship program will be called "Last.fm Discovers," hosted by Sat Bisla. The station will play music based on the total number of plays, artists that show significant growth, and the most favorited music on Last.fm. Doesn't that seem like a better way to choose a radio's playlist than a robot or a single DJ? We think so.

Perhaps the major limitation to this new radio station is that it's only available on HD Radio. The format has nowhere near the reach of FM radio, despite the improved quality. However, that will probably change as the technology becomes cheaper and is standard on more and more vehicles. Luckily, it will also be available online.

We're rooting for this experiment to succeed. We believe that social media crowdsourcing is an incredible tool for understanding what the people want and how people react (for example, we are able to quickly gauge opinions about Obama's health care speech via Twitter crowdsourcing).

Do you have an HD radio? Will you tune in?