[stomato]

I really like the idea, but am unsure about execution.

For example, datassette starts off with big differences in volume: http://musicforprogramming.net/?three

I've been listening at work for years and what works for me is:

Dark (in minor) soundtracks (electronica and classical).

Classic rock (usually in minor) that has a mostly consistent sound.

and various types of white (and other colored) noise in https://mynoise.net/ (where I donate so there are no limitations)

I used to listen to Pandora and other stations, but I found the transitions and switching songs would get distracting, so now I just listen to the same set of songs on loop.