From "Star Trek: The Next Generation: Preemptive Strike (#7.24)"
My father played the klavion. When I was very young and afraid of monsters under my bed... he played for me. He said that the klavion had... special powers. Monsters were afraid of it. And when they heard it they would disappear. When I listened to that music he played for me... I was never afraid to go to sleep. When he died... I realized even he couldn't make all the monsters go away.