[DaveBlake]

Its just a shame Kodi has to rescan the entire collection each time you add 1 album!!

Now Zag you should know that isn't true. :p

Library update runs through the music source(s) looking for changed or new folders or files, otherwise how is it meant to know what you added? You will see it checking through all your music, looking at timestamp and size. But it only actually scans the tags from those that are new or changed.

Yes finding the new/changed things takes a little time if you have a large collection, but no where near the time it takes to scan the tags from every file the first time the surce is added.

Partial Library Scan: Adding An Album to a Large Library
Also rather than do a library update, to add some new music you can trigger a scan of just part of a music source. Navigate in file view to where the new album is located and from the context menu choose "scan to library", that will just process that album, or folder of albums etc.

This means having "Update library on startup" disabled too.

But if you can't remember what you added or changed, then a full library update will find it for you.