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In page Legato:

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In classical singing, legato means a string of sustained vowels with minimal interruption from consonants. It is a key characteristic of the bel canto singing style that prevailed among voice teachers and singers during the 18th century and the first four decades of the 19th century.[citation needed] Usually referred to as the line, a good, smooth legato is still necessary for successful classical singers. In Western Classical vocal music, singers generally use it on any phrase without explicit articulation marks. Usually the most prevalent issue with vocal legato is maintaining the "line" across registers.[citation needed]