These terms refer to additional notes that you can achieve with a diatonic harmonica. Like "bending" the notes are elicited from the holes by changing the shape of your mouth (aka embouchure.) Typically, the holes through which overblows are obtained are 4, 5, and 6. And overdraws are achieved on holes 7 and 9. More information can be found in various references including, http://members.tripod.com/%7Ediatonic/, and www.overblow.com/harmonica.

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