Midvoice I (Early Mutation Stage): Notice the ‘broken-up’ uppermost and middle partials and the waving in most of the partials. That ‘broken-up’ feature would be heard as some degree of breathiness in the vocal tone. The wavering might be explained by ‘efforting’ to reach previously ‘easy’ higher fundamental frequencies (pitches). Also, notice that there is some vibrato that may reflect over-efforting to overcome a loss of clarity and strength in higher fundamental frequencies (pitches).Read More →