There is no have to. You can stick with one or your can create your own program for listening. Your goals are unique to you so using Sonic Access will be unique. I find I listen to the one that relates to my dominant thoughts just before listening. Or what I was working on during the day.
The music portion you can listen to without headphones if you're doing other stuff.. If you're continuing from the first track keep them on and continue your meditation for best results.
Alex
