(I've been a musician and programmed all my life too, but never have music playing when concentration is needed, i.e. when programming. When music is on, I concentrate on the music! It seems so weird to me that people would attempt some complex programming task with music playing! Hmm and mostly when I do want music these days it comes out of me: I imagine/remember it–hear my favourite stuff in my head, or imagine playing it, or tap rhythms, or play an instrument..)
1. Music does not improve my concentration in the long term. It will help for a few hours and then make it harder to focus after that.
2. Headphones make me less approachable at work, and I want to contribute to a positive team culture by being easy to chat to. If I need to buckle down I will work from home.
3. Headphones make it much more tempting to watch youtube, or listen to podcasts in the background. Without headphones I find it much easier to keep myself on track.
4. Most importantly, silence at work makes me appreciate music a whole lot more when I do listen to it, because it is no longer simply background noise, it feels worthy of attention. On top of that, I am more capable of listening to more demanding and more rewarding music.