== Further Update ==
It has moved! http://www.liveplasma.com/
== UPDATE ==
I found it 5 Months later!
Its called musicplasma and its here I guarantee you hours of fascination.
I also found music-map, but musicplasma is nicer, nicer to look at *and* more informative, and it now also has a movie search.
== d. ==
I used a website a while ago which let you type a band name in to a box,
then displayed a picture with circles, each a with a band or artist in it
related to the one you searched for.
If you clicked on one it became the centre. I think there were links at
the side to albums you could buy, from Amazon perhaps?
Can I find it again? (no obviously) Can you help? Please...