Śruti

In Indian classical music, a shruti is a microtonal pitch interval — the smallest gradation of sound that a human ear can detect and a trained voice can produce. The ancient musicologists enumerated 22 shrutis within a single saptaka (octave), forming the tonal foundation from which the seven svaras (notes) and all rāgas are derived. Shruti represents the precise intonation that gives each rāga its distinctive emotional color and identity.

Shruti is the primordial act of divine listening made manifest as sound. Just as the Vedas are called Śruti because they were 'heard' by the ṛṣis in deep meditation, musical shruti represents the subtle vibrations of Nāda Brahman — the cosmic sound that underlies all creation. To perceive shruti is to refine one's inner hearing toward the divine frequency that connects the individual ātman to the universal consciousness.

At the absolute level, shruti dissolves the distinction between the hearer, the hearing, and the heard. It points to Anāhata Nāda — the unstruck sound that resonates eternally without cause or cessation. The 22 shrutis are not merely acoustic divisions but are expressions of Brahman's infinite potentiality condensed into perceivable form, each microtone a doorway from the manifest world of vibration back to the silence of pure being.