Music is a great help in motivate you or it can calm you down. Bowers wrote in a post on her Ballet Beautiful blog that she likes to exercise to Mozart, Bach and Beethoven.
Though ballet is normally danced to classical music, it doesn’t have to be; one of my favourite tracks is of Verona’s Breathe and Fiona Sit’s 醜小鴨天鵝湖 (the Cantonese version of Morning Grace, the Princess Tutu anime theme song) . But for ballet purists there are plenty of classical music albums for ballet classes available to purchase.
If you are exercising at home where you live with someone else or at the gym, then it might be a good idea to purchase an armband for your phone or iPod you can stretch and workout to the music without disturbing anyone else.