I can only speak personally of course, but... Is music bad for concentration? Yes. But is music bad for WORKING? God no. It really depends on what I'm doing.

I can only speak personally of course, but... Is music bad for concentration? Yes. But is music bad for WORKING? God no. It really depends on what I'm doing. Playing music makes work (and made school work) far more pleasant (and thus easier) to do. But there are time when I need to concentrate, and for that I turned down the music. So, the answer? "It depends."