Riding a bike is about focus on the ride for me not music or any other distractions but each to their own.
The only time I experienced the effect was on a group ride when one chap insisted that listening to classical music through his blue tooth set soothed him and aided concentration. To be fair he was quite new to bikes having only passed his test 2 or 3 years before but following him in the group one morning he had more than enough near misses, misread corners and non-spotted hazards for me to make sure I was well ahead of him when he was following me later in the day - not sure whether this was directly related to the music listening though, if it did aid his concentration then god knows what he was like without it!