The practice of coming together to chant sacred sounds, mantras, prayers, or names of God exist in most, if not all, religious and spiritual traditions. It is a form of meditation which is truly powerful.
According to Hindu tradition, there are three ways of chanting mantras; (1) Manasa, chanting within ones mind, (2) Upamsa, soft chanting for one's own hearing (japa, or chanting on a rosary), and (3) Vacik, loud chanting together with others such as kirtans. Of them all, the last form is considered unparralelled in its potency. It's even stated that each are progressively 100 times more powerful than the previous...
Here are excerpts of chants from a variety of traditions, to give you a little taster:
Judaism: Qyria Yéféfia (Ora Sittner)
Islam (Sufi): Allah-Allah-Allah (Oruç Güvenç & Tümata), and Tum Agar Yuhi Nazren (Nusrat Fateh Ali Khan)
Christianity: Regina Caeli (Gregorian chant), and Taizé (click on anyone on this site)
Hinduism (Gaudiya Vaishnavism): Radhe Shyam (Vaiyasaki)