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She delivers every clunker of a line with her full chest voice and a twinkle in her eye.

Vocally, this choice is slightly challenging because it’s in the higher range of the mezzo-soprano chest voice, Glass said, adding that you need a strong belt and a mastery of quick words.

The note jumps also cross between chest voice and head voice for many singers, which is a challenge for the inexperienced, she added.

“With a lot of singers you can tell when they go from head to chest voice; it’s two different voices,” he said in an interview for the same book.

One good habit to help children sing well is to ask them sing in their head voice rather than their chest voice.