I could play the harmonica, and play it well, since I was a teenager. However, I could not "bend" a note on a blues harp - despite repeated demonstrations and "lessons" from talented musicians.

Last summer, while hiking in the Andes, I had my "epiphany." It was so easy. The explanation can from a young Dutch hiker in our group.The action for bending a note is the same as whistling on the inhale. BINGO!

Sincerely,
Gargoyle