Listening to the same "meditative" album over and over again (such as Kraftwerk's Autobahn) can induce a Pavlovian effect of entering flow states easily ;)
I do the same thing and it was life changing for me when I discovered this. I just have to remain mindful of making sure to stop the music when I choose to take a break/procrastinate.
1. "Mundane work" - Anything, with or without lyrics. I'm a huge fan of funk, Motown, classic rock, city pop, and more.
2. "Some concentration" - Opera or instrumental music. The oud is one of my favorite instruments and I have a playlist devoted to Middle Eastern music that has lots of oud-focused songs.
3. "More concentration" - Ambient music and atmospheric sounds. For instance, there's an hour-long YT video of the ambient noises from Thief: The Dark Project that I can put on, as well as a few others from other games.
It varies a lot. For many years I mostly listened to heavy metal or hip-hop while coding. I've also always listened to classical music instead, at times. But more and more over the last couple of years I've drifted to listening to synthwave / darkwave / retrowave type stuff when coding. It's still a mix of "all of the above" but the ratio has gradually skewed more and more in favor of the synthwave stuff.
Every once in a while I'll opt for something completely different like one of those "coffee shop sounds" tracks or something.
It is relevant for me. I am WFH but there can be noisy children outside my window. Unfortunately I can't really get away from it but I so own a pair of noise cancelling earphones. Those with some music makes the problem go away. So I am always interested in what people listen to while they work.
I would actually enjoy hearing keyboard clicks come through my headphones while I listen to music. I wonder if there's something that can make that possible.
Each key hits a different part of the keyboard's plastic under-plate, resulting in a slightly different sound. I wonder where you could source the sounds..