Mostly SomaFM somafm.com channels, most recently a bit of Digitalis but also Groove Salad. Downbeat with mostly no lyrics - which can be distracting.
However, and this is crazy, if I really need to crank out the work I tune to RadioNigel’s British and American 80s rock. It’s the stuff I was listening to as a kid back when I was learning Pascal and Logo. It’s weird because otherwise I never listen to 80s rock. I guess because I know the lyrics I don’t get distracted by them.