In the history of the Hebrew Thought there are some points about the value of music and chant wich can seem contradictory. Generally speaking, the rationalistic thought tends to forbid music, especially in profane uses because of its lascivious character. On the contrary, mystical thought tends to considerer music and chant as a way of spiritual rising. The Zohar, the great book of the Hebrew medieval mysticism, considers music as an esoteric thing related wich mysticism and prophecy.