To be honest, it really helps me a lot and I love listening to music while I am playing poker, especially after midnight. With my experience of playing poker, most of the times when I listen music, I have made better decisions. It makes me feeling more comfortable and more risky. I prefer to listen music when the tournament is in the crucial phase, because the play there is very important and the decisions must be on the highest level to win the tournament.
Many friends laughed at me from that statement, but you should follow yourself and to do what you think.