I found instructions here. You can do it manually, album-by-album.
- Right click on the album you watch to match.
- Select "More" from the right-click menu.
- Select "Match Album Info".
- Follow the dialog. For songs whose name doesn't match the name in Microsoft's database, you will have to choose the correct name from a list.
Edit: This is a long and arduous process, and does not work for all albums. I estimate it will take at least 5-10 hours before I finish matching all of my albums. Not only that, but "matched" albums do not propagate to my other machines (i.e., I would have to repeat the matching process on each machine), which share the same music library via SkyDrive. This is not a workable solution by any stretch of the imagination. If anyone has a better solution, I would love to hear it.