The drum's a member of the percussion group of music instruments, technically classified as a membranophone.. Drums consist of at least one membrane, called a drumhead or drum skin, that's stretched over a shell and struck, either directly with parts of a player's body, or with some sort of implement such as a drumstick, to produce sound. Other techniques have been used to cause drums to make sound, such as the "Thumb roll". Drums are the world's oldest and most ubiquitous musical instruments,… (More on Drum)