The Plex Media Server scans and organizes your media, then lets you stream it to all of your devices. It's the central, most important piece of Plex. Once installed, it gets to work scanning and cataloging every piece of media, making it look beautiful and intuitively organized.
From version Plex Media Server 1.16.6.1592 (smb):
Please Note: The creation of new "Premium Music" libraries on SHIELD is currently unsupported and all existing Premium Music libraries will gracefully fall back to using standard library matching. Improvements are actively being worked on and are Coming Soon (within the next few months, latest)!

See goo.gl/CHv2uD for a list of what’s new.
All versions