Harmonica
har-mon-i-ca / hɑrˈmɒn ɪ kə /
Noun
a hand-held rectangular musical instrument played by exhaling and inhaling through a row of metal reeds
"I daydream about a high school where everybody plays the harmonica: the students, the teachers, the principal, the janitor and the cook in the cafeteria."
Richard Brautigan (1935-1984)