These pages comprise a dictionary of terms relating to the pipe organ. Please keep definitions to a few sentences, and do not include pictures or sound clips. When more space is needed for a term, a new page can be created for it. Bach, Johann Sebastian [1685-1750] - arguably the most important composer of organ music. Backfall [noun] a lever used in a mechanical action to convert "push" motion into "pull" motion. Backfall Bridge Balanced Action Band Organ Barpfeife [noun] - an 8' manual reed with short resonators, yielding a soft growling tone. Bearing Shaft Bellows Book Pneumatic Boutique Bridge Bung