Bell chord

A bell chord, also known colloquially as "bells", is a technique used in musical arrangement in which single notes of a chord are played in sequence by separate instruments (or multiples of the same instrument) which sustain their individual notes to allow the chord to be heard. It is, in effect, an arpeggio played by several instruments sequentially. This is also known as a "pyramid" or "cascade". It is common in barbershop music.