Part of a discussion by Voice Teacher Jack Li Vigni (Tenor, Voice Teacher Royal Opera House Covent Garden, Curtis Institute of Music, Brooklyn College, Director of Mediterranean Opera Studio and Festival) on the importance of learning the delicate timbre.
This is a selection of Maria Callas where her ability to sing with the delicate timbre in the middle voice is vividly in display. Her delicateness leads to a variety of artistic and interpretative possibilities that would otherwise be impossible. This clip is a study clip made for sopranos to listen over and over to so as to learn the acoustic qualities of the gentle timbre. If you can hear it in your head, you can eventually learn to reproduce it.