My Macbook's Touch Bar hides itself after a period of inactivity and re-awakes when the Magic Mouse or trackpad are used. Usually this isn't a problem, but I have started using a Wacom tablet which doesn't wake up the Touch Bar.
Does BTT have a way of keeping the Touch Bar display switched on? Ideally only when plugged into AC power.
I think that's to save the OLED screen. And I'm afraid you can't change that. But am not sure. 
Ah, yeah that would make sense.
In that case is there any way I get it to wake up every time a song changes in the Music app? The only thing I use the Touch Bar for is as a now playing widget.
This widget is also available for the notch bar, where it remains always visible.