Google Music scan-and-match feature comes to the United States
Google has brought its iTunes-like scan-and-match service for Google Music to the United States today after previously launching the service in Europe around a month ago. The service allows you to scan your music and find a match for it in the Google Cloud so that you aren't required to upload your tracks to the server.

Better yet is the price. While Apple and Amazon charge around $25 a year for this service, Google is offering it for free for up to 20,000 tracks. Google also has not put a size limit on these tracks, and they say they will allow you to stream at 320 kbps. You can, however, only download it at a similar bit-rate to that of the track you uploaded.
You can check it out and get uploading at Google Music. Now, I wonder if this will allow me to fix all of my messed up tags...