When I'm concentrating, I'm almost completely oblivious to whatever is going on around me. So as long as I can work someplace where I won't get stepped on, or run over, I'm fine.
I have had workmates tap me on the shoulder asking "Have you heard anything in our conversation the last 5 minutes?"
Though, horribly and to my disgrace, I get somewhat grumpy when those who know how to, get into my head with unrelated questions to the one I'm working on...
I do like music playing, but like many others, the tougher the problem the quieter the music (and correspondingly... the more successful the louder the music )