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my-tuneglue-map, originally uploaded by kd1s.

So I happened upon this little online experimental site called TuneGlue. Key in an artist then click on the record and select the Expand option.

What you see in this image (1280×800 – sorry but it just had to be widescreen) is just my lower left quadrant based upon a search on “Change”.

So now you know how last.fm’s ‘tune by artist’ works. It connects relationships between artists. Oh and if you download and install iTunes and last.fm it’ll scrobble the tracks you play in your iTunes library. In essence, it looks and sees what might be related to what is in your library which explains how David Bowie ended up in my suggestions.