Taal ke Das Prān

North Indian theory education still teaches the ten prāṇa of taal — kāla, mārga, kriyā, aṅga, graha, jāti, kalā, laya, yati and prastāra. Their practical status is not equal: the tenfold package is taught, but not all ten have living use.

Laya — the rate and periodic continuity of musical time — is fully living. So is graha: whether a composition begins on sam, before it (anāgata) or after it (atīta). A displaced entry never moves the actual sam or the hand cycle; the player hears the true structure and the displaced phrase at once.

Mārga, the ancient units of kāla, and much of historical prastāra are kept in theory but are largely historical in practice; several of their older forms are reported as no longer in use. They explain where the system came from, not how a modern cycle is held.