Kirtan is the second stage in Navadha Bhakti, the traditionally
prescribed nine forms of devotion in Srimad Bhagavad Purana (VII 5.23).
It is also known as Nama Gana.
Kirtan is an act of singing, chanting, dancing or speaking
in praise of god, incarnations or holy persons, to the accompaniment of harmonium,
flute, conch shell, stringed or percussion instruments and like.
Source – Bhavan’s Journal December 2016 issue – page 23 –
article titled ‘Kirtan brings one closer to the Supreme Being’ by Dr. Satish K.
Kapoor.