In Hinduism, Bhajan and its Bhakti analog Kirtan, have roots in the ancient metric and musical traditions of the Vedic era, particularly the Samaveda.
The Vedas and Upanishads celebrate Nada-Brahman, where certain sounds are considered elemental, triggering emotional feelings without necessarily having a literal meaning, and this is deemed sacred, liminal experience of the primeval ultimate reality and supreme truth [REF].