A friend turned me onto this today. It uses tag technology but not in the usual way where users add tags. It’s not social software. You type in a song or artist name, and it searches its database for “other songs and artists that have musical qualities similar to …” (in my case, to test it, I used John McLaughlin) “because it features jazz fusion elements, a tenor sax solo, an acoustic guitar solo, electric bass playing and electric guitar accompaniment” in other words, elements similar to what they found in their database for John McLaughlin.

Coolio.

But… it only accepts users who can provide a US zip code. Damn.