I disagree. For certain tasks, certain types of music, ideally albums I have heard many times before, help me to relax and stay focussed. For others, I cannot concentrate with music.
I find it quite a disadvantage in my current office that when I need to do something detailed in a rigorous way I do not get to wear headphones.
Additionally, I've noticed that during the planning stage music is less helpful/possibly distracting. However, once I've more or less decided what to do and am focused more on implementation music can help me focus.
Music is distracting when you need to be creative, because your creative brain is effectively distracted by the music. I read about a study[1] recently that presented a programming problem to two groups; one group listened to music while they solved it and the other group had silence. While each group performed acceptably with regards to creating a solution that conformed to the spec, the music-listening group neglected to notice that a series of transformations in the problem spec turned out to result in no changes whatsoever. The group working in silence was able to make the connection and came up with a more efficient program.
[1] Sorry, can't find the source. Will update if I find it.
I don't disagree with your point, but the 'study' is essentially an anecdote about two incidents, in which the difference could just as easily be about the group members involved; I think one cannot draw significant conclusions from it, as described.
I find it quite a disadvantage in my current office that when I need to do something detailed in a rigorous way I do not get to wear headphones.