It's called a WOOFYT. That's short for "Wooden Octave of Organ Pipes for Young Technologists". Educator and organist Roy Tankersley has built a WOOFYT out of bits of wood and drain pipes. He takes it round schools and other places where children gather, to teach them how a pipe organ works.

Fifteen of them can play on the WOOFYT at once, some of them pumping and others tending to each of the individual pipes. The result? Organ music. Of a sort.

The pipe organ used to be known as the King of Instruments but it's lost a lot of its popular appeal these days. David Steemson goes to an Organ Discovery Day, is introduced to the WOOFYT, and meets some bright young sparks and a few older organists who're still sparking.