Om Ah Hum Vajra Guru Padma Siddhi Hum.

I've been intrigued by the spiritual sound of the Gregorian chant tradition VS Tibetan chanting. We have no real clear way of hearing the ancient chants, but the more recent Gregorian music and its settings in resonant churches are also curious. Many ancient traditions used resonating sound chambers. I tend to think of Tibetan chants happening in a dzong or cave, and that it sounded more like early blues-spirituals.

An invocation means "to call on, invoke, to give”, and may be a prayer, or spell, a command in identification with certain spirits. A chant incantation may be a hymn or mantra repetition of words or formulas to perform other magic, or a formula of liberation or overcoming.