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How many beats are in a measure of 4/4 time?

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In 4/4 time, also known as common time, there are four beats in each measure.123

In this time signature, the top number indicates the number of beats per measure, while the bottom number specifies the note value that receives one beat—in this case, the quarter note. While 4/4 is categorized as a simple time signature, it is often considered a species of duple time because it typically includes a subsidiary stress on the third beat.23