
If the first or any other musical unit returns in varied form, then that variation is indicated by a superscript number- A 1 and B 2, for example. Subsequent contrasting sections are labeled B, C, D, and so on.

The first statement of a musical idea is designated A.

In his textbook 'Listening to Music,' professor Craig Wright writes, To aid in the process of describing form, musicians have developed a simple system of labeling musical units with letters. 3 Common forms in Western classical music.Musical form unfolds over time through the expansion and development of these ideas. These organizational elements may be broken into smaller units called phrases, which express a musical idea but lack sufficient weight to stand alone. In 'Worlds of Music', Jeff Todd Titon suggests that a number of organizational elements may determine the formal structure of a piece of music, such as 'the arrangement of musical units of rhythm, melody, and or/ harmony that show repetition or variation, the arrangement of the instruments (as in the order of solos in a jazz or bluegrass performance), or the way a symphonic piece is orchestrated', among other factors. In music, Form refers to the structure of a musical composition or performance. T = kethuk, P = kempul, N = kenong, Gong = gong ageng. Ketawang structure (a gendhing form) as a clock diagram.
