Historical Tenors - Discographies, repertoires, and short biographies of many tenors.
History of the Tenor Voice - Paper from the first international conference on Physiology and Acoustics of Singing (PAS), held in the Netherlands in 2002.
Voice Definitions and Ranges - Explains how the names of polyphonic parts were adapted to identify voice types, with emphasis on the tenor and countertenor.
Wikipedia: Baritone - Defines the singing range as lower than tenor but higher than bass, with subclassifications including lyric, bel canto and dramatic.
Wikipedia: Soprano - Lengthy article describes vocal quality and typical range for subtypes from coloratura to dramatic, with a list of soprano roles in the operatic and musical theater repertoire.
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