I just started working on it this week after getting made redundant last Friday. It's MIT licensed and up on Github[0] too.

[0] https://github.com/kudos/match.audio

Cool. Any reason Amazon isn't on the list of providers?

No reason, I'm still adding providers. It's barely MVP right now.

Appears to be down for me - http://d.pr/1clOg

Should be ok again, bad deploy. I need to fill out the test suite some more to catch all of the edge cases of the various APIs involved.

a bookmarklet that worked on mobile browsers would be very useful.

Interesting, how would you see that working?

similar to the readability bookmarklet here:

https://www.readability.com/bookmarklets

for example: if an rdio page is already open, click the bookmarklet to see all the other services

I've since built a chrome extension, I'll make it work as a bookmark too.