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Matching feature on the Google Play Music Manager
The new matching feature for the Google Play Music Manager streamlines the process of uploading your personal music to Google Play. We’ll scan the song library you want to upload, and where possible, match your songs with our catalog, so you don’t have to upload each song.You’ll still see all of your songs progress through the Google Play Music Manager. Those that we can match will be available for streaming at a 320kbps bitrate. Matched songs count against your 20,000 song limit. Songs that can’t be matched will be uploaded so you have access to your whole collection.
If you’re a longtime Google Play Music user, you don’t need to re-upload your files to have them matched. In the next few months, we'll automatically match what we can of your existing library.
This really belongs in the forums.