What is indicated by the notation "common time"?

The notation "common time" refers specifically to a time signature of 4/4. This designation is widely used in musical notation and is a standard time signature that indicates there are four beats in each measure and the quarter note receives one beat.

In music, common time is often represented by a large capital 'C' on the staff, symbolizing its conventional use in a wide range of musical styles. It provides a steady and predictable rhythmic foundation, making it one of the most frequently used time signatures in both classical and popular music.

The other time signatures listed, such as 3/4, 6/8, and 2/4, while important, are not what is traditionally referred to as common time. Each of these has its own distinct characteristics and uses: 3/4 is often associated with waltzes, 6/8 provides a compound feel, and 2/4 is used in marches. Therefore, understanding that "common time" specifically signifies the 4/4 meter is crucial in both reading and interpreting musical scores.