Answer :
The best-known 12-tone composition by Copland is "Piano Variations." This piece showcases Copland's exploration of serialism and the twelve-tone technique, which was a departure from his more traditional American style.
While "Fanfare for the Common Man" is a well-known work by Copland, it is not a 12-tone composition. "Billy the Kid" and "Connotations for Orchestra" are also significant works by Copland but do not fall into the category of 12-tone compositions.
In conclusion, when considering Copland's best-known 12-tone composition, "Piano Variations" stands out as the most prominent example of his exploration of this specific musical technique.
While "Fanfare for the Common Man" is a well-known work by Copland, it is not a 12-tone composition. "Billy the Kid" and "Connotations for Orchestra" are also significant works by Copland but do not fall into the category of 12-tone compositions.
In conclusion, when considering Copland's best-known 12-tone composition, "Piano Variations" stands out as the most prominent example of his exploration of this specific musical technique.