iTunes Match was recently released. iTunes Match syncs your library with iCloud and allows you to download songs that were previously imported from purchased CDs so that you can have them at AAC quality, which is what the iTunes store currently uses. This results in higher quality music for the end user.
It also gives you the ability to sync all your music to the cloud so that you can listen from any device. No more having to figure out how to share libraries across multiple Macs, etc.
Here’s how to set it up.
1) When you download the latest update of iTunes (iTunes 10.5.1) you will be given a new menu item in the iTunes side bar for iTunes Match. Click on it.
2) If you opt in, you will have to pay $24.99 for a 12-month subscription. You will be asked to sign in with your Apple ID.
3) At this point, iTunes Match will scan your library to find songs that match your library in the iTunes music store.
4) From there, it will begin uploading remaining songs to your iCloud library. Be patient, this part may take some time. When it’s done, you will be informed that your music is now available on the cloud.
5) You can now do this with additional computers. Now, your iTunes library, and your previously imported music will be available on the devices that have been setup with Match.
6) Now go to your iOS device. From there, you can turn on iTunes Match by going to Settings>Music>iTunes Match. Here, you can switch it on, and choose Show All Music this will make it possible to listen to your music on your iOS device by streaming from iCloud.
For more information, you can check out Apple’s iTunes Match Guide here.