Don't laugh, but for me, it's Abba. Their entire discography is ~3 hours which is how long I can maintain peak concentration. Their songs are consistently good so that I don't need to skip a song, but not too good that I would stop working and start listening. Plus I've never heard Abba song in any good movie so it doesn't remind me scenes from a movie I would want to rewatch. Of course I don't listen to it every day, only when I really need to, most daily programming tasks can be done with any music.
For real concentration I can't have lyrics but that's a great idea for other flow states. Mozart and Brahms are good for me ... Not slow enough to put me to sleep not fast enough or unusual to make me pay attention to the music.
I vary a lot but when I do classical music Mozart has occupied quite a lot of my stats, in particular a clarinet concerto by Katherine Lucy [1] and also things like Beethoven's 6th (pastoral, it's beautifully featured in Fantasia) or Grieg's morning mood.
I play that song too while programming (along with several dozen others on a dedicated programming playlist). Eventually it goes into the background and just covers up outside noise. Some key moments are noticed -- i stop looking at my screen, repeat after the singer, and then go back to working five seconds later.
The Winner Takes It All lyrics are great for commits and Pull Requests: I don't wanna talk
If it makes you feel sad
And I understand
You've come to shake my hand
I apologize
If it makes you feel bad
Like others have said, for specific types of activity, I'll prefer no vocals or maybe even no music, but if vocals are fine Abba does have a great flow to it. I used to run to Abba too, at times, because it feels upbeat/positive with good enough tempo. Super trouper, for instance, makes for a great booster.
As a dancer it’s funny to me that programming and dancing both seem to be better with a disco soundtrack. Or house, or funk. Anything with a strong backbeat.
No laughter here, my brother in music. This is one of the few vocal groups that I could be in the zone with, except "Fernando", because one must release their inner theater kid with that one.
