Analysis of foreign language learning:

Uncle Satchmo in jazz, "Uncle with a bag mouth", refers to the trumpeter Louis Armstrong. The nickname Satchmo is actually a short name that combines Satchel's "schoolbag" and Mouth's "mouth".

so, why is trumpeter Louis Armstrong called Uncle Satchmo? Because Armstrong had a big mouth since he was a child, his companions often used exaggerated nicknames to make fun of him when he was a child. Such as "wide mouth" Gatemouth, "sucker mouth" Dippermouth, and "Satchelmouth" and so on.

One day when he grew up, Armstrong came to England for an interview with a music magazine. When he met him, the reporter kindly called him "Hello, Satchmo! Armstrong thought the abbreviation was cool after hearing it, so he simply took Satchmo as his nickname. Later, Satchmo became the title of his second autobiography.

Since then, Uncle Satchmo has become the orthographic trademark of Louis Armstrong.