A clearer view of singing voice production: 25 years of progress.

Voice research has enjoyed its most productive period of history during the past 25 years. Many of the enigmas related to the biomechanics and acoustics of the singing voice have been resolved. This paper presents state-of-the-art understanding regarding the following topics: vibrato, the singer's formant, formant tracking, voice registers, subglottal pressure, voice classification, modes of vocal fold vibration, laryngeal position during singing, flow glottography, and singing synthesis. In addition to these topics, the people who have made the most significant contributions to the advancement of singing research are recognized.