Thanks for your reply Limnos
When I play a track using Quicktime rather than iTunes it play an incorrect tune. Bad!
I saved the current iTunes Library.itl file and replaced it with the previous version (14th July 2015) and it fixed some of the issues but not all, so I tried going back to a previous version (1st July 2015) and it looked to have solved the issue buy when I double click on a song it plays it but the track then disappears from iTunes.
I thought it was an issue with Apple Music update in 12.x.x of iTunes as my TV Shows and Films are in there normal order. The following link replicates what my issue is:
http://www.technobuffalo.com/2015/07/02/itunes-12-2-has-a-huge-bug-read-this-bef ore-updating/
The iTunes Library.itl file that is the file is around 3.6Mb in size but if I look back to the 1st July one it is 2.2Mb and the 14th July one is 3.5Mb. My iTunes Library has not grown in any significant way since July. Has the iTunes software update in July changed the iTunes Library.itl size?
Is there anyway to view the iTunes Library.itl file in a readable format?
Backups: This is bad, my Time Capsule ran out space a month or so back and couldn't back up any new changes/additions so I formatted it and ran a brand new full backup as I thought the music library mix up was a software issue caused by the update and a fix would come soon.
Is my music catalogue technically know as knackered?