Radio anyone?
Back in my radio days we had two turntables and four cart machines. We mostly played music on lps and commercials on cart. We then evolved to more music on cart, then cd's, but continued to use the turntables because of our huge lp library.
My fav thing was to queue up the lps for play. Put the headphones on and listen to the "wa wa" that denoted the right spot. Our carts were also marked with things like "ends suddenly" along with the duration of the song. That way we knew to hit that turntable switch asap! The last thing we wanted was "dead air". Our coffee, soda, and bathroom breaks were usually taken during "Free Bird", "Inna Godda Davida", and "Do You Feel Like I Do". It was a miracle that I never spilled anything on the console board or turntables! LOL