The same library or playlist is good - I used that trick for time tracking when I was training for the marathon.

Had a eclectic playlist where I would start with some quite chill Mozart because I would always start too fast and needed to pace myself for example then after the 2/2.5 hr mark is when I'd usually start to fade and some prog rock would come on to boost my spirits.

Funnily I have banned listening to classical for most coding but that's a me problem because I end up listening too closely and analysing the music and performance too much. But that's just because I'm a classical nerd