l once had an app doing that, but nowadays just use a suitable youtube music stream instead.

One would think so, but for me, I noticed that it works best with the insanely fast pace.
My brain desperately tries too follow the rythm but is soon completely overwelmed by the galloping double-base and just gives up trying to pay attention to anything, while the music begins to mentally blend into a sort of highly structured noise, finally covering your thoughts on the way to sleep.