what subjects are included in this class differ among sources. The Charanavyuha mentions four Upavedas: Archery (Dhanurveda), associated with the Yajurveda Architecture (Sthapatyaveda), associated with the Rigveda. Music and sacred dance (), associated with the Samaveda Medicine (), associated with the Atharvaveda. "Fifth" and other Vedas Some post-Vedic texts, including the Mahabharata, the Natyasastra and certain Puranas, refer to themselves as the "fifth Veda". The earliest reference to such a "fifth Veda" is found in the Chandogya Upanishad in hymn 7.1.2. "Divya Prabandha", for example Tiruvaymoli, is a term for canonical Tamil texts considered as Vernacular Veda by some South Indian Hindus. Other texts such as the Bhagavad Gita or the Vedanta Sutras are considered shruti or "Vedic" by some Hindu denominations but not universally within Hinduism. The Bhakti movement, and Gaudiya Vaishnavism in particular extended the term veda to include the Sanskrit Epics and Vaishnavite devotional texts such as the Pancharatra. Puranas The Puranas is a vast genre of encyclopedic Indian literature about a wide range of topics particularly myths, legends and other traditional lore. Several of these texts are named after major Hindu deities such as Vishnu, Shiva and Devi. There are 18 Maha Puranas (Great Puranas) and 18 Upa Puranas (Minor Puranas), with over 400,000 verses. The Puranas have been influential in the Hindu culture. They are considered Vaidika (congruent with Vedic literature). The Bhagavata Purana has been among the most celebrated and popular text in the Puranic genre, and is of non-dualistic tenor. The Puranic literature wove with the Bhakti movement in India, and both Dvaita and Advaita scholars have commented on the underlying Vedanta themes in the Maha Puranas. Authority of the Vedas The various Hindu denominations and Indian philosophies have taken differing positions on the authority of the Vedas. Schools of Indian philosophy which acknowledge the authority of the Vedas are classified as "orthodox" (āstika). Other śramaṇa traditions, such as Charvaka, Ajivika, Buddhism and Jainism, which did not regard the Vedas as authorities, are referred to as "heterodox" or "non-orthodox" (nāstika) schools. Certain traditions which are often seen as being part of Hinduism also rejected the Vedas. For example, authors of the tantric Vaiṣṇava Sahajiyā tradition, like Siddha Mukundadeva, rejected the Vedas' authority. Likewise, some tantric Shaiva Agamas reject the Vedas. The Anandabhairava-tantra for example, states that "the wise man should not elect as his authority the word of the Vedas, which is full