Indian classical music
Udit Pankhania tunes his Tabla. The skin is tensioned by a number of cords that run down the sides; inside each pair of cords is a large wooden toggle. The further down the barrel of the drum the toggle is moved, the tighter the skin is made, raising the pitch.
The black circles in the middle of each drum skin, which enable an even wider variety of sounds to be made, are built up in layers of rice starch mixed with coal dust.
Quote image reference: 400D_12247.jpg
Photo copyright © 2008, unknown