The Sama Veda, Samveda, or Samaveda (Sanskrit: सामवेदः, sāmaveda, from "melody" and "knowledge"), is the third of the four Vedas, the ancient core Hindu scriptures, along with the Rig Veda, Yajur Veda, and Atharva Veda. It ranks next in sanctity and liturgical importance to the Rigveda. It consists of a collection (samhita) of hymns, portions of hymns, and detached verses, all but 75 taken from the Sakala Sakha of the Rigveda, the other 75 belong to the Bashkala Sakha, to be sung, using specifically indicated melodies called Samagana, by Udgatar priests at sacrifices in which the juice of the Soma plant, clarified and mixed with milk and other ingredients, is offered in libation to various deities. The Brihat sama is given special importance by the lord Krishna in the Bhagavat Gita in Chapter 10 called the "Vibhuti Yoga". Here the god Krishna tells about the great souls, valuable materials and supreme objects which have taken their perfect forms on Earth and among them the lord says he is the existing spirit of the Brihat Sama. While its earliest parts are believed to date from as early as 1700 BCE (the Rigvedic period), the existing compilation dates from the post-Rigvedic Mantra period of Vedic Sanskrit, c. 1200 or 1000 BCE, in the early Kuru Kingdom, roughly contemporary with the Atharvaveda, the Yajurveda, and the Rigvedic Khilani. The verses have been transposed and re-arranged, without reference to their original order, to suit the rituals in which they were to be employed. There are frequent variations from the text of the Rigveda that are in some cases glosses but in others offer an older pronunciation than that of the Rigveda (such as [ai] for common [e]). When sung the verses are further altered by prolongation, repetition and insertion of stray syllables (stobha), as well as various modulations, rests and other modifications prescribed in the song-books (Ganas). Sama
