Final answer:
The Fibonacci sequence is the mathematical pattern commonly found in musical compositions.
Step-by-step explanation:
The mathematical pattern commonly found in musical compositions is the Fibonacci sequence. The Fibonacci sequence is a series of numbers where each number is the sum of the two preceding ones. This sequence is found in various aspects of music, such as the structure of melodies, rhythms, and even the arrangement of musical sections. For example, composers often use the Fibonacci sequence to determine the length or number of measures in different sections of a piece.
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