From wikipedia.org the meaning of Melisma.
In music, a melisma is the technique of singing one syllable to a lot of notes. They are often called vocal runs or simply runs. Melisma is today commonly used in Arab, Middle Eastern, African, Balkan, and African American music, and various Asian folk and popular musical genres. Melisma is also commonly featured in Western popular music and is utilized by countless pop artists, although this form usually involves improvising melismas (and melismatic vocalise) over a simpler melody. The Melisma is a common feature of Stevie Wonder's music while the trend in R&B singers was popularized by Mariah Carey's "Vision of Love".[2][3][4] In recent years, there has been increased criticism of melisma being abused by singers, in part due to the popularity of shows such as American Idol and the trend of contestants imitating the artists who popularized the technique.[5].
Apart of Carey, this singing style was accomplished by singers like Christina Aguilera and Puerto Rican Luis Fonsi.



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