It's spelled "Satchmo," and it was a nickname given to Louis Armstrong.
Louis Armstrong
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Louis Armstrong
Louis Armstrong
Louis Armstrong
Louis Armstrong.
Louis Armostrong, because of his satchel like mouth
An example of a well-know trumpet player is Wynton Marsalis.
This person, a well-known trumpet player, was known by the nickname "Satchmo."
Louis Armstrong.
Louis Armstrong
Louis Armstrong.