Which CD to Put

You are participating in the school run. You and your friends have decided on the running clothes, accessories and shoes that they are going to wear for the run. You all have even zeroed in on plugging CD players into the ears while running. After all, this will certainly up your groups cool quotient But this is where the dilemma begins. What music should you listen to while running? It has to be something better and cooler than your friends. Such a quandary you are in and all your mother tells you to take one of those CDs on the rack. Her argument is who is going to know which music you are listening to. Will she understand at all?