How is that any different than any other 'related' songs that are already in last.fm?
I think the thing you should remember, accept, and come to terms with is, last.fm will *always* be based on
chaos.
I would assume that the vast majority of people play the vast majority of their music on some kind of shuffle or random selection.
It takes alot of work to create custom playlists, I've been listening to music for nearly 30 years and playing on computers for over 20 of them, I've created specific custom playlists a handful of times for a handful of situations.
It simply is not a common thing.
Most other playlists would be a random selection of an artist or genre, or even a mostly random selection selected for car cd's.
Throw in the fact that some people will specifically try to skew the popularity of their favorite artists/tracks (see the radiohead/coldplay examples)...
And finally, you have the last.fm radio streams...
Last.fm has it's own built in 'scrobblerdj'.
They are called: tag radio, loved radio, recommended radio, neighbor radio, personal radio, just to name a few off the top of my head.
How do you think that last.fm comes up with these various radio playlists?...
By playing the 'related' songs that it already knows about at a minimum, and I'm sure there are factor's involved that we can only assume.
So the radio streams *already* strengthen the various relationships that *already* exist. And wow, this is an integrated part of last.fm!
Now, if you really want to listen to music that is hand picked related to each other, then you may want to try out
Pandora.
Pandora is very similar to the various last.fm radio channels, but instead of built on the
*chaos* of
user submissions, its based on specific musical traits that are somehow related to each other.
You enter a track or artist and pandora will play a selection of tracks based on the 'musicality' relationships. Music geneology or something they call it.
Of course the obvious downfall for pandora, and for last.fm radio is, they are streamed. So you must be online and have sufficient bandwidth to support the audio streams.
If you want to create custom playlists of musically related tracks in your library, I recommend trying out
MusicIP Mixer.
MusicIP mixer does something similar to pandora, in which tracks that are related by the musical/sound characteristics are used to generate the playlists according to the various options you can specify.
Anyway, I do think your concerns have merit, however I do think that with fact that a basically unlimited number of users are submitting anything from completely random, to playing the same song/artist all day 24/7, that last.fm will always be based on this chaos, and that hopefully the last.fm design takes into account the extremes and lets them have only minor influences on the overall results.
Wow thats a long post, thanks for reading if you got this far.
edit:
Here is a post about an article about the various music streaming/relationship things like last.fm/pandora/musicip...
http://www.mediamonkey.com/forum/viewto ... t++article
edit 2: well crap, looks like the article no longer exists, and I can't find it on their site any more...
Here is the slashdot article if your interested.