<qa>  What is a small, flexible tube called?Patients with spasmodic dysphonia, muscular tension dysphonia and vocal tremor may be eligible for this study. Individuals who smoke or use tobacco, who have vocal nodules or polyps, or who have a history of airway obstruction may not participate. Candidates will be screened with a medical history and physical examination, a questionnaire, voice recording repeating sentences into a microphone, and nasolaryngoscopy examination of the larynx with a tube advanced through the nose. For the nasolaryngoscopy, the inside of the nose is sprayed with a decongestant to open the nasal passages and possibly a local anesthetic. A small, flexible tube called a nasolaryngoscope is passed through the nose to look at the larynx during speech and other tasks, such as singing, whistling and prolonged vowels. 