I do best when I focus on complex tasks by not being distracted by random background sounds.
So perhaps counter intuitively I put on music that I have listened to before when I have a complex task.
I have a complex task today and so I put on an album so that I could focus on the task. I am doing great and making more progress than just randomly listening to songs.
The music feels safe and fades into the background and I focus on the problem at hand. In one company I wore my headphones all the time and listened to relaxing music. It really made my day better in every way.
Find what helps you focus and do it. It doesn’t matter what your coworkers think your reality is your own.