Pipe organ
Each pipe can play only one note which depends on its size. The small pipes play high notes and the large pipes play low notes. Each pipe has its own special sound which depends on the material it is made from (whether it is wood or brass or spotted metal) and on the shape of the pipe. The pipes are arranged in "ranks" so that all the pipes of the same shape and material can be controlled to play a tune together, without all the others.