Assertion: tenor's sound | /r/CapableOf | facilitate clarity
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text: Based on their descriptions in Vincenzo Giustiniani's Discorso sopra la musica (1628), Potter has suggested that singers such as Caccini, Cenci, Puliaschi, and Rasi, employed an "open speech-like sound" which facilitated the agility and clarity of expression for which their voices were renowned.