Bends are changes in notes. Think of bends as hidden notes that are accessible by technique. Take the four draw on a C harp you go from a D note to a Db (D Flat) same as on the one hole by using a bend. In the picture below you’ll see all the accessible notes available on a harp, by using bends. Bends are just a way of accessing these notes. They can not be accessed by just draw blow on the harp. You have to use a different technique (bending) to get to them.
To help you do bends harmonica.com has a tool you can use to practice with.
Bend It Better™ – The Tool That Helps You Bend Harmonica in Tune!
Here is a lesson in bending from John Gindik:
