For those who perform it, the haḍra marks the climax of the Sufi's gathering regardless of any teaching or formal structure - it often follows a formal teaching session as a way of internalizing the lessons. Musically, the structure of the haḍra includes several secular Arab genres (each of which expresses a different emotion) and can last for hours. It is directed by the sheikh of the tariqa or one of his representatives; monitoring the intensity, depth and duration of the phases of the haḍra, the sheikh aims to draw the circle into deep awareness of God and away from the participants own individuatedness. The dhikr ceremonies may have a ritually determined length or may last as long as the Sheikh deems his murids require. The haḍra section consists of the ostinato-like repetition of the name of God over which the soloist performs a richly ornamented song. In many haḍras, this repetition proceeds from the chest and has the effect of a percussion instrument, with the participants bending forward while exhaling and stand straight while inhaling so that both the movement and sound contribute to the overall rhythm. The climax is usually reached through cries of "Allah! Allah!" or "hu hu" (which is either the pronoun "he" or the last vowel on the word "Allah" depending on the method) while the participants are moving up and down. Universally, the haḍra is almost always followed by Quranic recital in the tarteel style - which according to al-Junayd al-Baghdadi, was a prophetic instruction received through a dream.