The harmonica is the ONLY instrument that lets you…

[chase]

There are tons of instruments that do this. Biggest being the accordian.

[pixelvnce]

I love back ground harmonica music playing

[nothomelessonyoutube]

Also guys flick your tongue when you blow and draw. You will hear how it sounds.

[casthedemon]

The accordion and concertina would like a word.

[jessebott]

How much of controlling the air supply is with the tongue? Just wondering if the same skills of blowing a duck call would transfer over. I’d say 80 percent of calling is cutting off the air with the tongue and make noises with the throat.

[ARSHDEEPSALUJA]

Morchang, is an instrument that does the same, check your facts

[Identman]

Not the only instruments that has diatonic bellows. An accordion does too.

[h.joshi_]

The only instrument you can't see while playing..

[trippyboi]

i can play trumpet by drawing air through it. not well. but its doable

[georgesadventures]

You don't know the instrument the acordigan can