Learning Tracks are unique because they are recorded wtih your vocal usually in the left channel. The other 3 parts
are in the right channel. This means that you can learn your part by turning the balance to 100% left channel.
In a car this is ideal because you are sitting near the left channel. When your are comfortable you can gradually turn
the balance towards the right channel so that you can hear the other 3 parts and sing along with you part in the left channel.

Eventually you can turn the balance to 100% right channel, remove your vocal part and then inject your own voice by singing
along, all in the comforts of your home or car. You are now singing in a quartet! Welcome to the world of A Cappella
singing.