Indefinite pitch refers to sounds that do not have a specific musical note or frequency. Unlike notes like A or C, which can be clearly identified, indefinite pitch sounds are more like noise. Examples include the sound of a drum or a cymbal, where the pitch is not easily discernible. These sounds can add texture and rhythm to music, even if they don't fit into traditional melodies. In music, indefinite pitch is important for creating atmosphere and emotion. Composers often use instruments like shakers or tambourines to produce these sounds. By incorporating indefinite pitch, musicians can enhance their compositions and engage listeners in unique ways.