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"Last.fm is the undefeated champ of the social music space - the service is great and now that the network effect has kicked in it's virtually unstoppable.  It's the ultimate reconstructor and a textbook social software play - complete with personalization, social recommendations, rating, voting and tagging.  Throw in a sprinkling of ajax, wrap it up in a bow and call it an acquisition target.  I'm even starting to use it instead of Pandora.  In short: Last.fm rocks.\nSurprising, then, that we haven't seen more social music.  Yeah, so Yahoo has personalized \"radio stations\" in the form of LaunchCast Radio, complete with a lousy IE-only client and a low quality free version (low quality in the sense that you have to pay for CD quality sound).  But in the startup space I've seen very little (the exception is Mercora, which I found impossible to use).  So all hail Muiso, an exciting new entrant in the social music space.  Well, perhaps.\nTo be honest, Muiso doesn't really impress.  It's in pre-beta, which would explain a lot, and I guess it's unfair to compare it to an established player like Last.fm this early in the game.  What's more, Muiso is taking a different route - instead of having a database of songs on their server, the downloadable client tracks your listening habits on iTunes, Windows Media Player and other music software, then recommends playlists.  At least, I think that's how it works - after playing around with it for 20 minutes I eventually gave up.  It's an interesting idea, but I'm not really sold on it.\nThis also brings me back to the issue of first mover advantage.  I agree with Umair that FMA truly exists in the social software world - the 25th social bookmarking site to arrive on the scene will have a really hard time, even if it offers a superior service.  I get the sense that Last.fm has the momentum to dominate this space, simply because the more users a social music service has, the better the recommendations will be.  Muiso et al will struggle to achieve this kind of scale."^^<http://www.w3.org/2001/XMLSchema#string>
<http://mashable.com/2006/01/31/muiso-vs-lastfm/>