I find music too distracting, so I use ambient rain or wave noises - nothing with too much sonic contrast, no details to stand out and draw my attention.

The "focus at will" app is pretty good for minimally distracting music though.

I found noise generators to be very helpful when I was studying or reading in places prone to distracting noise. I did find that either the noise or the presence of the headphones started to get annoying after an hour or two

I find music or even some banal sports talk (almost functioning as noise) to be helpful in allowing me to accomplish tasks that require some thought, but nothing deep. Anything requiring deeper thought, I need quiet.