In 6/8 time, there are 2 beats per measure, and one dotted quarter note has one beat. In 9/8 time, there are 3 beats per measure, and one dotted quarter note has one beat. In 12/8 time, there are 4 beats per measure and one dotted quarter note has one beat. In 6/16 time, there are 2 beats per measure and one dotted eighth note has one beat. Etc. Another way to extend the duration of a note is by using the tie.