Kirtana (Sanskrit (IAST): kīrtana; Sanskrit for "praise; eulogy"; also sankirtana) is call-and-response chanting performed in India's bhakti devotional traditions. A person performing kirtana is known as a kirtankara or, colloquially, a "kirtaneera". Kirtana practice involves chanting hymns or mantras to the accompaniment of instruments such as the harmonium, tablas, the two-headed mrdanga or pakhawaj drum and hand cymbals (karatalas). It is a major practice in Vaisnava devotionalism, Sikhism, the Sant traditions and some forms of Buddhism, as well as other religious groups. Kirtana is sometimes accompanied by story-telling and acting. Texts typically cover religious, mythological or social subjects.
Example video: Krishna Das: Kirtan Wallah - "I Phoned Govinda"
Example via www.ramdass.org: The Man Behind the Kirtan: A Talk with Krishna Das