Copying Music library between two Macs

[sajr]

Hello All,
I have two macs both running the latest version of Catalina. I want to copy the Music Library from one to another and have attempted this so far but itdoes'nt feature all the songs listed on the first Mac on the second Mac. The first mac is storing it's library on its internal SSD and the second will be storing on an external Thunderbolt drive. Can anyone advise of the best way to do this?
Thanks

 

[Dave Braine]

Just drag and drop the iTunes Folder from the first Mac onto the Thunderbolt drive. With the TB drive connected to the second Mac, open iTunes while holding down the Alt key, and navigate to the iTunes Folder on the drive and select it.

but itdoes'nt feature all the songs listed on the first Mac on the second Mac.

Are they songs purchased from the iTunes Store? Could it be an "Authorisation" problem on the second Mac?