Hope this helps a bit. A single Reed is used for a Clarinet or Saxophone etc. It is clamped the the mothpiece, the mouthpiece goes into your mouth and is stabilized by your top teeth. Air forced past the reed makes it vibrate, making sound. Oboe is a double Reed... Reeds are made of bamboo or plastic and some I think from metal. Its been a while since I played. Accordian - Air is forced in or out by pushing and pulling the air chamber. When a key is depressed, it opens a reed and therefore allows it to vibrate, - one key per musical note, ie: A,B, C,D,E,F,G. and flats and sharps, (the black keys) ie: A# = A sharp..... Harmonica - You are the airbag! acually your lungs. Have fun. If I am totally off base, let me know..... ALSO, It could be from an ORGAN, depending on the size.