Does the SE/music.SE setup allow moderators (or anyone else other than a question author) to accept an answer on the author's behalf? Some people just aren't good at remembering to accept answers and where there is a clear best answer, marking it accepted seems like it's good to the site.
Your answer is in meta.stackexchange, namely in:
No, this is a user-oriented site.
It is intended to answer people's questions. They know their problem the best and know what solves it for them. We need to leave it up to them to accept whatever answer they want. People will know what the community agrees with by the upvotes. The power to accept an answer should stay in the user/asker's hand. That way you have both opinions/views in a question.
StackExchange does not do exceptions in these rules for particular sites.
(I'm not sure what is the policy if a Q on a child meta is a dupe of a Q on the big meta, I hope I didn't do anything wrong.)