I don't listen to anything because it's too distracting. Some people say that classical music (no lyrics) helps them. If I'm in a coffee shop or somewhere not very quiet, I'll listen to a white noise track on my phone.
Usually? My dogs barking at something or a lot of background noise. No music though. I think it was would bad to get used to having music when I cant have any come test day
I take my PTs next to an open window in my house so I can hear all the outside noise. Trying to train myself to concentrate even with other things going on in the background. It has actually helped too.
I don't listen to anything. I get enough background noise from family members talking. At the beginning of my studies I listened to Deep House and the Atmospheric Calm playlist on Spotify, but it became too distracting.