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I read once that opera singers go for an effect called squillo (spelling?) which means that they are producing enough overtones for the sound to project.
"I try to let it sound natural and warm, more than drilling too much in the squillo ," he said, referring to the piercing sound singers use to project over an orchestra.
As her remorseful lover, Riccardo, tenor William Davenport took a while to warm up but soon revealed a large, open voice with plenty of "squillo," a trumpet-like resonance that gave it a heroic ring.
(Unboxed) (Health and Beauty) newly tagged "women" squillo RT @DrJenGunter: Check out my appearance on ABC 7