Definite pitch refers to a sound that has a specific frequency, allowing it to be identified as a particular musical note. For example, the note A4 has a frequency of 440 Hz. Instruments like the piano or guitar produce definite pitches, making them suitable for playing melodies and harmonies. In contrast, sounds with indefinite pitch, such as those produced by a drum or cymbal, do not correspond to a specific note. Definite pitch is essential in music, as it helps musicians tune their instruments and create harmonious compositions.