निताइ dasa
Nitai's servant's servant
Haraye Namaha
Krishna Yadavaya Namaha
Gopala Govinda Rama
Sri Madhu-su-dhana
Hare Krishna Hare Krishna
Krishna Krishna Hare Hare
Hare Rama Hare Rama
Rama Rama Hare Hare
So it is clear, Lord Chaitanya's very first Sankirtana was not an abstract interpretation of the Mahamantra. We see Chaitanya sing (it started as a song then became a chant and then the parade and then the dance) to another - "The Name of Hari, Krishna and Yadava, Cow Protector, Cowherd, Rama! The beautiful slayer of Madhu! Vishnu of Krishna, oh Krishna! Krishna! Vishnu of Rama! oh Rama! Rama!"
So, Sankirtan seems to be a human quality of devotion to a cherished personality that is too strikingly like a human yet a God, that goes way, way back in our being from long ago. Why do the hands raise up? Reaching? To the sky? Humans have been doing this for a long time. They want to hold the hands up - to the sky. When they do this with a song and chant to a Lord, some sort of "electricity" goes through the body down the fingers, arms, shoulders, to the brain, like the electrolytes of drinking water.
Yes that is a beautiful pastime. There were no instruments at that time, so the Lord simply clapped the tune with His associates. I feel clapping creates every personal touch in Kirtan. Afterwords the Lord ordered the khol drum to be created for kirtan, with each of the straps of a Mrdanga representing the 32 syllables of Maha-mantra.