The answer is the "Man at the Crossroads".
The most controversial mural of Diego Rivera in which he reflected his communist ideologies is called Man at the Crossroads. The mural was destroyed because the image of Vladimir Lenin, a communist was included.
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Short answer-half note.
In common time the quarter note equals one beat, and there are four quarter notes in a measure.
Songs in alla breve contain two beats per measure, with the half note equaling one beat. That means that the time signature of the alla breve is represented as 2/2 (not 4/4 as common time is).
