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Compound Meter is when the beats in a musical piece are subdivided into three smaller beats. The compound time signature is easy to recognize since it will have the numbers 6, 9, or 12 (numbers that can be divided by 3) on top.
Let's take a closer look, but first, we'll look at the musical meter. Then we'll learn the difference between a simple and a compound meter. And finally, we'll focus on the compound meter and its time signatures.
Musical meter is how the beats are organized in a piece of music. But the musical beats can be arranged on different levels.
First, the main beats of a piece form groups depending on where the stronger beats fall.
The most common groupings are in 2's, 3's, and 4's, called duple, triple, or quadruple meter.
When we listen to a piece of music and focus on the beats (where we want to stamp our feet or clap along), we may notice that some beats are stronger than others. If we call the strongest beat 1, some common groupings are 1-2, 1-2-3, and 1-2-3-4. Like this:
Next, each main beat can also be felt as subdivided into either 2 smaller beats (1-and 2-and, etc.) or 3 smaller beats (1-and-and 2-and-and, etc.).
If the beat is subdivided into 2 smaller beats, it is called Simple Meter:
With the subdivision in 3 smaller beats, it is called Compound Meter:
The meter is written in the score as two numbers in the beginning of the staff. This is called a Time Signature.
The Compound time signatures are, as mentioned above, easy to spot. They have the numbers 6, 9, or 12 on top. Some commonly used are:
It can be any note value, really, but the most common here are 4 (=quarter note), 8 (=eight note), or 16 (=sixteenth note).
Compared to Simple Time Signatures (where we have to imagine the subdivision of the beat in 2's to be sure it is not compound), Compound Time Signatures show all the "smaller" beats (as the bottom number).
But we must still group the beats in 3's to understand if it is in Duple, Triple or Quadruple time. The main beats in compound time could also be seen as dotted note values:
What's interesting is that the beats are grouped in 3's. So in time signatures with 6 on top, the beats are grouped 3 + 3. But since it is two groups, this is Duple meter or, in this case more specifically, Compound Duple.
Some famous pieces in 6/8:
Time signatures with 9 on top are in triple time (3+3+3):
Some famous pieces in 9/8:
And time signatures with 12 on top are in quadruple time.(3+3+3+3)
Some famous pieces in 12/8: