Does music help you focus?

My son loves listening to music when he is working on homework.  He also likes setting time goals: 30 minutes of work, then a break.  This allows him to truly focus, and then run around a bit to get his wiggles out (he is in the 6th grade).  Though his phone could accomplish each of these separately, there is a way to combine both music and timers with your Apple phone.  Simply play music from any app and set the 'Stop Playing' timer.