Effects of Finger Kazoo Exercise With and Without Oropharyngeal Enlargement in the Operatic Singing Voice

Inclusion Criteria

• •Classically trained singers aged 18 to 45 years.
• •Scoring below the cutoff for vocal handicap on the Singing Voice Handicap Index-10 (SVHI-10 ≤ 6 )\*.
• •No history of recently vocal fold pathology or laryngeal surgery.
• •Non-smokers and no current upper respiratory infection.
• •Willingness and ability to attend two experimental sessions spaced 48 hours apart.