However, there is another way of looking at rhythm—the modern musical approach, which is called additive rhythm. This is when a short beat—such as a sixteenth—is multiplied to produce various groupings of beats. Here the numbers two and three play a crucially important part.
String two beats together, and one type of rhythmic grouping results. String three beats together, and another results.
When these groups are combined in the additive fashion, interesting results ensue. If two such groups or rhythmic cells are combined, four possibilities are obtained (see Figure 14.1)—a grouping of two plus two (a), two plus three (b), three plus two (c), and three plus three (d).