The term 'Rhythm Keeper' refers to a person who is responsible for keeping the rhythm of a song or performance. This can be done by playing a DRUM, creating a DRUMBEAT, or using a metronome. A DRUM is a percussion instrument that is played by striking it with sticks or hands. A DRUMBEAT is a pattern of sounds created by playing a DRUM. A metronome is a device that produces a steady beat to help musicians keep time. All three of these tools are used by Rhythm Keepers to ensure that the performance is in time and has a consistent rhythm.