The Sound Index from the BBC is a ‘buzz' index of bands and tracks that are being talked about on the web. Every six hours the Sound Index uses IBM's Semantic Super Computing to crawl sites like Bebo, MySpace, Last.FM, iTunes, Google and YouTube to find out what people are writing about, listening to, watching, downloading and logging on to. From this, the site works out the most popular 1000 artists and tracks on the web. The site explains:

The more blog mentions, comments, plays, downloads and profile views an artist or track has, the higher up the Sound Index they are. So, the Sound Index is a music buzz index controlled entirely by the public.

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