Every year my wife and I host a St. Patrick's day party. I am in charge of the music.
First came records, and I was stuck next to the turntable (nobody else was allowed to touch my Thorens or later, my Rega).
Then came cassettes, and I would let someone else change them. But they all had to be recorded first.
Then came CDs, and someone else could change them too. A 5-disk Sony changer made it easier to mix the music without needing to record cassettes for hours and hours.
But when we moved to Texas and went all networked and wireless, I started my quest for the ultimate, streaming, synchronized system. This search is still on, but that's another story.