In the military, a CDC is a Career Development Course. It's like a series of home study books to help you in your career specialty, and advance in rank. gromit801 Â· 1 decade ago
Aleatoric music, also known as aleatory music, is music with a random element. Chance elements within a piece can be used for composition, as well as for live performance. When a piece is being composed, random elements can be used to influence the outcome of a final musical piece.
Program music is Instrumental music associated with nonmusical ideas often inspired by nature, art, or literature. It is associated with a story, poem, idea, or scene. Program music is music that tells a story, in music e.g-Vivaldi's The Four Seasons.