Here is a paragraph that pretty much sums up how fantastic a musical instrument the harmonica is. From the classic John Steinbeck novel The Grapes Of Wrath…
“A harmonica is easy to carry. Take it out of your hip pocket. Knock it against your palm to shake out the dirt and pocket fuzz and bits of tobacco. Now it’s ready. You can do anything with a harmonica: thin reedy single tone or chords, or melody with rhythm chords. You can mold the music with curved hands, making it wail and cry like bagpipes, making it full and round like an organ, making it as sharp and bitter as the reed pipes of the hills. And you play and put it back into your pocket. It’s always with you.”
John Steinbeck, The Grapes Of Wrath