The term 'slow interval' can be summarized by the word 'LULL', which is a four-letter word. A LULL is a period of calm or inactivity, often used to describe a temporary pause in a storm or other chaotic event. It can also refer to a period of time in which activity or progress is slow or stagnant. In music, a slow interval is a section of a song that is played at a slower tempo than the rest of the piece.