From the blog "Emby Blog"
Emby Server 4.6 is currently rolling out. Here are the highlights.
Rewritten Music Scanning
This 4.6 release will rescan your music library. We apologize if this causes any inconvenience. This solves a lot of our previous music-related shortcomings, specifically:
Any folder structure now accepted, no matter how clean or dirty
Albums are now fully tag driven and are no longer tied to folders
Local metadata for albums will still be supported, and local metadata for