1. In an organ pipe with a beating reed, the slotted metal tube against which the reed vibrates to produce a tone when air pressure is directed into the pipe (or less commonly, a wood tube, as in certain band organ trombone pipes). The slot is slightly narrower and shorter than the reed, so the edges of the reed beat against it. The bottom end of the tube is capped to make it airtight, and the top end fits into the block that acoustically connects it to the resonator. The shape of the(cylindrical, conical, end perpendicular or angled, etc.), the shape of the reed, and the shape of the resonator all contribute to the tone quality of the pipe and determine whether it sounds like a trumpet, clarinet, oboe, baritone, etc. 2. In an organ pipe with a free reed, a similar tube but with a slot slightly wider and longer than the reed, so the reed vibrates through the slot. Beating reed pipes are commonly found in European and American fairground and band organs, while free reed pipes are more common in European orchestrions.