What is the time signature of a Compound Quadruple measure?

A Compound Quadruple measure typically has a time signature of 12/8. This signifies that there are four beats in a measure, and each beat is subdivided into three parts (representing the eighth notes). In a compound time signature, the top number (12) indicates the total number of subdivisions, while the bottom number (8) indicates that the eighth note is the smallest note value used in the measure.

The time signature 12/4, while appearing similar, suggests a different grouping. It would indicate four beats per measure with each beat equating to a quarter note, which is not characteristic of compound time where the focus is on subdivision into smaller note values.

Thus, while 12/4 retains the notion of having four beats and could be perceived as quadruple, it does not capture the compound nature of subdividing those beats into groups of three. Therefore, the essence of the question lies in understanding that a Compound Quadruple measure is best represented by a signature like 12/8, which emphasizes grouping the beats into sets of three for a more complex rhythmic feel.