Yesterday I outlined the top Music 2.0 websites according to Compete. If one looks to Comscore instead, a slightly different line-up results:

Compete
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1. Project Playlist
2. imeem
3. Last.fm
4. Pandora
5. PureVolume

Comscore
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1. imeem
2. Pandora
3. Project Playlist
4. Last.fm
5. PureVolume

Here’s the trend:

top 5 per comscore

Comscore metrics may be superior to those of Compete and others because it uses a perfectly weighted sample. OTOH, I don’t have the cash to pay for a perfectly weighted sample ; )

Similar insights here, nonetheless: Pandora continues solid growth but imeem and Project Playlist demonstrate the highest rates of growth over the last 8 months. (Not sure why Last.fm is available only since January.)

Anyone hazard a theory as to why imeem and Project Playlist have grown so quickly?