I was so excited about iCloud and backing up my iTunes account - and so I bought iCloud and copied my iTunes to it and it was a huge, HUGE, MISTAKE!!!!!
Here is what happened to me. I have a little over a thousand albums - many rare of theater soundtracks and concept albmus. I had them carefully organized (highlights from Les Mis, Les Mis original broaday cast, Les Mis original london cast, etc.). I spent days finding all of the correct album artwork and made sure they were loaded with the song information in the correct order, merged two discs onto one album. I had invested thousands of hours and iCloud backing up iTunes wiped it all out. It deleted "duplicate" songs and albums, lost album artwork, on CDs that were uploaded it changed to he quality so there are some that aren't very loud and others that blast your ears.
I have now spent many months rebuilding my library - and am about halfway done.
It was heartbreaking! If you use iTunes - do not use iCloud. Save your time and effort and use Amazon's more expensive cloud service that works and won't delete or re-order your music library. I tried Amazon's service with about 20 albums and it was flawless. It didn't change a thing!
Apple does so many things right, I never considered that they could have a dog of a product, but they do and it is the combination of iCloud and iTunes.
USE iCLOUD WITH iTUNES WITH EXTREME CAUTION AND IF YOU LOSE YOUR MUSIC - YOU WERE FOREWARNED!!!!!!!!!