A gatra ("embryo" or "semantic unit") is a unit of melody in Javanese gamelan music, analogous to a measure in Western music. It is often considered the smallest unit of a gamelan composition. A gatra consists of a sequence of four beats (keteg), which are filled with notes (or rests, pin) from the balungan. In general, the second and fourth beats of a gatra are stronger than the first and third, and the final note of a gatra, called the seleh, dominates the gatra. In other words, the gatras are like Western measures in reverse, with the strongest beat at the end. Important colotomic instruments, most notably the gong ageng, are played on that final beat. If the final beat in a gatra is a rest, the seleh is the last note played. It is not uncommon in gamelan repertoire to find entire gatra