How to lock a source of music ?

I wonder if it’s possible to lock the source of the music on a Spotify playlist ? When the music change, the next song that is automaticaly choosen is one of my tablet and not the following tune of the Spotify playlist.
If it’s possible, can i lock one turn table on one source and the other turn table on another one ?


there is queue section that if you drag songs into it will play in that order. But I am with you I would like to be able to say when queue runs out it default s to … and then have a choice of things like playlist or album or something.