Here is a passage from the book THE GRAPES OF WRATH by John Steinbeck.
"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 can play and put it back in your pocket. It's always with you, always in your pocket. And as you play, you learn new tricks, new ways to mold the tone with your hands, to pinch the tone with your lips, and no one teaches you. You feel around - sometimes alone in the shade at noon, sometimes in the tent after supper... Your foot taps gently on the ground. Your eyebrows rise and fall in rhythm. And if you lose it or break it, why, it's no great loss. You can buy another for a quarter.”