Tightening a drum head raises its pitch by making the stretched membrane vibrate faster.

The longer version

A stretched membrane vibrates in patterns set by how taut it is and by its size and mass. More tension means a disturbance is pulled back harder and travels across the skin more quickly, so the whole sheet completes its cycles faster and the perceived pitch climbs.

Unlike a string, a membrane has many modes at once that are not simple multiples, which is why a struck drum gives a thud with a sense of pitch rather than a clean note. Damping a spot with a hand kills selected modes and shortens the tail. Tuning lugs around the rim let a player even out tension so the modes agree.

Where this entry sits

Sound and Music gathers facts about how vibrations move through air and water, how ears turn them into meaning, and how instruments and notation shape what listeners hear. Expect echoes, pitch, volume, acoustics, and the odd silence in between. The full list sits on the Sound and Music page, where every entry is listed in order.