Topic: Kirtan
Easy 
from the Perfection of Yoga
by His Divine Grace A.C. Bhaktivedanta Swami Prabhupada
In India there are sacred places where yogis go to meditate in solitude, as prescribed in Bhagavad-gita.
Traditionally, yoga cannot be executed in a public place, but insofar as kirtan—mantra-yoga, or the yoga of chanting the Hare Krishna mantra: Hare Krishna, Hare Krishna, Krishna Krishna, Hare Hare/ Hare Rama,...