Lights Out Music is a term used to describe a type of music that is characterized by its slow, melancholic sound. It is often associated with the military, as it is commonly played during funerals and other solemn occasions. The term 'Taps' is a four-letter word that is often used to refer to this type of music. Taps is a bugle call that is typically played at dusk, signifying the end of the day.