Particularly, the guitar stackexchange. It was mentioned here and here (see @Rebecca Chernoff's comment) that they would likely be merged.
Now, I know the music Q&A site literally just went out of beta, and I don't want to sound impatient/ungrateful, but I'd really like to know: Is there any new word on this?
As explained in the link in Matthew's answer, we'll bring Guitars-SE content in in a week or two, once this community has had some time to get established, and after pro tem mods have been appointed.
The Area 51 proposals that were related/dupes were closed before this site launched in to private beta.
Edit: Guitars was merged a while ago.
This post on Guitars should cover all that. I don't believe there's any new information. Patience :)
