I realized I didn’t have my music on my laptop and since that is going to become the California computer I wanted my music.  I was preparing to do some difficult transfer thing, so I Google how to move music from my desktop to my laptop.  It told me to turn on Home Sharing.  I did, and the music transferred.  That was it.  No muss, no fuss.  And I still have two more devices that I can authorize.  I need to find out how to remove my old dead MacBook Pro from my list of devices.  Back to Google.