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Compound Duple Meter. Compound duple meter means that there are 2 beats in a bar (duple) and these can be divided into threes (compound). Compound duple time always has the number 6 at the top of the time signature. Examples include 6/8 and 6/4. Compound Triple Meter
The duple meter definition means that music in this time signature has to have two beats to the bar. Hence why people get confused, as in 6/8, you have 6 quavers (eighth notes) per bar. So how is 6/8 duple music?
There are four different types of metre in common use: compound triple (ex. 9/8). If each beat in a measure is divided into two parts, it is simple metre, and if divided into three it is compound. If each measure is divided into two beats, it is duple metre, and if three it is triple.
Any time signature with a 6 on top is compound duple. 6/8 and 6/4 are the most commonly used. 9/8 time is classified as compound triple . There are three beats (three dotted quarter notes), thus making the meter triple.
The six eighth notes can either be grouped into two beats (compound duple) or three beats (simple triple). Since the simple triple pattern already belongs to 3/4 time, 6/8 is compound duple. Notice that each beat in 6/8 is a dotted quarter note.
Compound meter (or compound time) is a time signature where beats divide into threes. For example, 6/8 is a compound meter because you can divide each dotted quarter note into three eighth notes.
Many folk songs and children's music often use duple meters due to their simplicity and ease of understanding. Duple meters can be contrasted with other meter types like triple and compound meters, highlighting different rhythmic feels within compositions.