I'd like to find more sites to upload and license production music.

So far I've had sales on Productiontrax and I also have tracks up at Audiosparx.

Does anyone have any other suggestions for sites? Thanks.

You should go to youtube which aside from having millions of subscribers they are also ranked pretty high on google. There are also some good sites like grouper, vidilife and bolt.

Aren't those all video sites?

I'm looking for sites that market production music...

I have not yet encounter such sites so I cannot add any more suggestion. You have a unique business btw.

It's a small sideline at this point, but there have been some opportunities open up this year for licensing music online.