11. "In fact I had a teacher who didn't want me to use my chest voice at all. 12. She was not afraid to use chest voice , but it was very musical and without vulgarity ." 13. Croft sang solos from first grade on, " but always in a high chest voice , " he said. 14. As a result, many vocal pedagogists have redefined or even abandoned the use of the term chest voice . 15. Appell defined chest voice as resonance below the vocal folds and head voice as resonance above the vocal folds. 16. For the purposes of this article, the term " chest voice " is adopted as it is less controversial. 17. The upper middle he describes as a mixture of predominantly head voice with a small amount of chest voice . 18. These vocal pedagogists prefer the terms " chest voice " and " head voice " over the term register. 19. The records also display a lively singing personality as well as a surprisingly strong chest voice and a mellow timbre. 20. Several singers have suggested that Callas's heavy use of the chest voice led to stridency and unsteadiness with the high notes.
