Music Does More than Help
Interestingly, music does more than help us train longer and harder, it can actually make us train more efficiently too. A 2012 study showed cyclists cycling to the same intensity actually required 7% less oxygen if they were listening to music than those that cycled in silence.
Furthermore the beats per minute of a track also has an effect until it reaches about 140 BPM. So anyone listening to Drum & Bass (averaging about 150-180 BP), according to this study at least, get no benefit from their listening choice.