In most familiar Western music composers choose notes derived from which are systems of organized pitches.?

In most familiar Western music, composers choose notes derived from the diatonic scale system, which consists of seven pitches organized into major and minor scales. These scales are built on specific patterns of whole and half steps, creating a framework for melody and harmony. Additionally, the chromatic scale, which includes all twelve pitches within an octave, is often utilized for added color and complexity. Together, these systems provide the foundation for the vast majority of Western musical compositions.