Before revision: Musical instruments may employ bellows as a substitute or regulator for air pressure provided by the human lungs: melodeon , concertina and related instruments Reed organ Pipe organ Musette de cour and some other varieties of bagpipes Harmonium and melodeon Portative Expansion joint applications The term "bellows" is used by extension for a number of applications that do not involve air transfer.
After revision: Musical instruments may employ bellows as a substitute or regulator for air pressure provided by the human lungs: Accordion , concertina and related instruments Reed organ Pipe organ Musette de cour and some other varieties of bagpipes Harmonium and melodeon Portative Expansion joint applications The term "bellows" is used by extension for a number of applications that do not involve air transfer.