Um_nik yes

I do

Yes!

Listening to Broken Ties — The Whistlers remix increases your brain power.

No, i find it really distracting

It really depends. For me, chillin' music (instrumental) can help me to be focus on somthing better. However, not everyone can have the same feeling as me. I do not try to concentrate on the playing music; it just creates an environment that there's no noise or other sounds.

Yes, I listen to music during a contest. It helps me lock in on the contest. I find that random artists screaming random words in my ear really helps me formalize my thought process. This is not sarcasm. ;)

Most of the times some anime background music or intro... Somehow it just helps me in staying focussed.

Yes, but only relaxing / low tempo stuff. I like Luna Li, Liana Flores and Ichiko Aoba for example.

If I put on some rock music I'm not concentrating well enough :)

I use brown noise to block outside noises

Yes! I can't go long implementation without BGM (TBH, in ICPC onsite contests, no BGM 5-hour is every time painful for me...).

Hardcore/Speedcore enjoyer here. The harder the music, the better.

I break away from the outside world during the contest(joke)

I've tried but I can't concentrate and think if there's music in the bg