 The practice of "nāda yoga" is an integral part of various other traditions as well, such as being a form of the advanced "thogal" practice in the Tibetan Dzogchen lineage, and is mentioned by H. P. Blavatsky, founder of the Theosophical Society in her book "The Voice of the Silence".The form of Surat Shabd Yoga, practiced by followers of Sant Mat and the Sikh tradition ("nanakpanthi"), is most commonly related to "nāda yoga".Furthermore, "nāda yoga" resembles and combines elements from the Hindu practices of "raja yoga", "laya yoga", and "bhakti yoga".