The document defines key elements of music including sound, harmony, melody, rhythm, and form. It provides definitions and examples for each element. Sound is described using the acronym SHMRF which stands for sound, harmony, melody, rhythm, and form. Texture, timbre, and dynamics are discussed as elements of sound. Major and minor scales are provided as examples for harmony. Melody is defined using concepts like range, shape, and motion. Rhythm includes tempo, meter, and pulse. Form examines concepts like repetition, variation, contrast, motives, and musical phrases.