It is often in Sanskrit, but may be in any language. The universal peace chants from the Integral Yoga kirtan (ordering information below) include verses in many languages.
Kirtan can be practiced alone, as I am in this photo, or in a group for personal and world peace. Chanting the mantra sounds of kirtan elicits a feeling of well-being, calmness and harmony.
Instruments for kirtan include the harmonium, rhythm instruments, and others, or just voices.
To prepare for your kirtan meditation, dress comfortably. Sit on a pillow or mat, or on a chair in a circle, if it is a group session. If the kirtan is in Sanskrit, begin by chanting 3 OMs and saying a prayer for peace.
Kirtan can be done responsively, i.e. the leader sings a line and the others echo it. Or, the leader or a choir may chant and others listen meditatively.
If chanting is responsive, there may come a time for being still; listening to the subtle vibration still sounding, or meditating on thoughts of world peace for at least 5 minutes.
During the silent portion sit with a straight back, eyes closed and hands in lap.
The session could be concluded with positive affirmations or prayers for world peace.
A universal peace chant in Sanskrit that I enjoy is Om Shanti, Om Shanti, Om Shanti, Om.

Over the years I've led many kirtans and in the CD, Integral Yoga Kirtan, led in Sanskrit by Sri Swami Satchidananda, I lead the Sanskrit responses. It can be ordered by going to this website: Integral Yoga Distribution and searching for INTEGRAL YOGA KIRTAN CD
In conclusion a verse ...
In stillness following kirtan
With a receptive open heart
What the mind cannot reason
Is found in the spiritual heart
As expansive love and care
For people everywhere.
Article - Susan Kramer
Photo of Susan Kramer playing the harmonium by Stan Schaap
Meditation Lessons - Introduction
Kundalini Meditation and Prayer
Mantra or OM Meditation
Tantric Meditation
Yoga Meditation
Tratak or Meditation on Light
Mandala or Yantra Meditation
Music Meditation
For offsite reading
Meditation for Teens and AdultsMore than 70 offerings, from guided meditation techniques to on-the-go stress relief and relationship meditations interspersed with verse, and a section of special occasion prayers. 114 pages.

