1 definition by Carlos Correa

Musthy (Môzthæë), in popular culture, is a way of refering to a song, usually a classic, which is considered by most people as "beyond art"; the word expresses a feeling of respect and awe for a song that delivers more than just music itself.

The term is very widely spread in Mexico and Central/South America, and extending to Southern U.S.A.
The word is mostly used as an adjective, as in "Hotel California is really Musthy"; although it is often used as a noun, as in "Bohemian Rhapsody is a Musthy".
by Carlos Correa November 22, 2006
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