Amusingly, I pick those because they provide a bit of variety but not so much as to be distracting while working. Usually music with words in it gets me focused on what they are actually saying and thus unable to do work.
Yes! That's precisely how I got on to them too... I can't listen to music with vocals while programming. I like various sub genres of electronic music, but even a lot of pure electronic music is a little too jarring sometimes (some is not of course). But, without spending too much time curating, movie scores are almost always a safe choice.
