What is a tabla?
The tabla is the pair of hand drums of North Indian music. The dayan, played with the right hand, is carved from wood and tuned to Sa, the tonic of the music. The bayan, played with the left hand, is a larger metal bowl that gives the bass, and the player changes its pitch by pressing the skin with the wrist. Both skins carry a black patch, the syahi; in 1920 the physicist C. V. Raman showed that this kind of loading makes the overtones of Indian drums fall in harmonic ratios, which is why the tabla can sound so clearly pitched.
Bols, thekas and taals
Tabla is taught by mouth: every stroke has a syllable, the bol, and students recite a pattern before they play it. A taal is a rhythmic cycle with a fixed number of beats grouped in sections, and its theka is the basic pattern of bols that announces it. Musicians keep their place by the sam, the first beat, where phrases end together, and by the khali, the "empty" beat where the bass of the bayan is left out.
Practising with the online tabla
Start slowly. Recite the theka while it plays, then clap the talis and wave on the khali, then play the bols yourself on the drums. When the cycle feels natural, raise the tempo a little each day. For the melodic side, the online sitar shares the same tanpura and taals, and the DrumPad lets you build beats from your own sounds.