Fade in, fade out music

Hey fellas!
In some games there is this neat effect that when you enter from one area into another, old music fades out and new one fades in. I am not entirely sure if this is in an easy manner achievable in GE. Any advice?
In some games there is this neat effect that when you enter from one area into another, old music fades out and new one fades in. I am not entirely sure if this is in an easy manner achievable in GE. Any advice?