(i) Music The sound which is pleasant to the ears is called music. It is produced by regular periodic vibrations. There is no sudden change in loudness, e.g. Sound produced from a tabla.
Noise The sound which is unpleasant to the ears, is called noise. It is produced at an irregular intervals. There is sudden change in its loudness, e.g. Sound produced in a market and the sound produced by an explosion.
(ii) Tone The sound of single frequency is called a tone.
Note The sound which is a mixture of several frequencies is called a note.