Any percussion instrument made of a cylindrical frame over which an animal skin is stretched.percussion instrument with a skin or other membrane, called a drum head, stretched over a hollow space. it is struck with a stick or the hands<br><br>A hollow cylindrical shell of any size that has a head stretched over one or both ends and is beaten with the hands or a stick. There are also electronic drums where no shell is needed, just a triggering pad. When struck, it triggers synthesized sounds of all types.