Pipes are cut at certain lengths to make notes.  When the leader points to the numbers on the poster board,
then the people with that number pipe hit their pipe with a nail.

Video of a song played with the pipes.

Example of poster board with pipe numbers on it

Example of some of the pipes and large nail.

 

Pipes instruction on making your own set of pipes music and the music to make
poster boards to play songs.  Mostly Christmas songs.