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In music, melisma is the technique of changing the note (pitch) of a single syllable of text while it is being sung. Music sung in this style is referred to as melismatic, as opposed to syllabic, where each syllable of text is matched to a single note. Music of the ancient cultures used melismatic techniques to achieve a hypnotic trance in the listener, useful for early mystical initiation rites (Eleusinian Mysteries) and religious worship. This quality is still found in much Jewish, Hindu and Muslim religious music today. In western music, the term most commonly refers to Gregorian chant, but may be used to describe music of any genre, including baroque singing and later gospel. Within Jewish liturgical tradition melisma is still commonly used in the chanting of Torah, readings from the Prophets, and in the body of the service itself. For an examination of the evolution of this tradition, see Idelsohn.

Melisma first appeared in written form in the system of Torah chanting developed by the Masoretes in the 7th or 8th century and then in some genres of Gregorian chant, with the earliest written appearance around AD 900, where it was used in certain sections of the Mass. The gradual and the alleluia, in particular, were characteristically melismatic, for example, while the tract is not, and repetitive melodic patterns were deliberately avoided in the style. The Byzantine rite also used melismatic elements in their music, which developed roughly concurrently to the Gregorian chant.

The French carol tune "Gloria" arranged by Edward Shippen Barnes in 1937, to which the hymn "Angels We Have Heard on High" is usually sung, contains one of the most melismatic sequences in popular Christian hymn music, on the "o" of the word "Gloria". Moreover, the choral work "For Unto Us a Child is Born" from Handel's Messiah (Part I, No. 12) contains impressive examples of melisma.

Melisma is today commonly used in Middle Eastern, African, Balkan and various Asian folk and popular musical genres. Melisma is also commonly featured in Western popular music, although this form of melisma usually involves improvising melismas (and melismatic vocalise) over a simpler melody, and is utilized by countless pop artists. The use of melisma is common in Indian classical and popular music.

• Angels We Have Heard on High
• Ding Dong Merrily on High

• American Heritage Dictionary of the English Language entry on "melisma"
• Virginia Tech Multimedia Music Dictionary entry on melisma