Sound is what we hear. Noise is unwanted sound. The difference between sound and noise depends upon the listener and the circumstances.
Rock music can be pleasurable sound to one person and an annoying noise to another.
In either case, it can be hazardous to a person's hearing if the sound is loud and if he or she is exposed long and often enough. Sound is produced by vibrating objects and reaches the listener's ears as waves in the air or other media. When an object vibrates, it causes slight changes in air pressure. These air pressure changes travel as waves through the air and produce sound. To illustrate, imagine striking a drum surface with a stick.