| http://www.w3.org/ns/prov#value | - While a singer might occupy any of these nine types throughout his career, the first seven of them also can be seen as a progression over time: Occasional Strainers turn into Strainers then Screamers, and Screamers turn into Raspers and Growlers, which represent a near-nadir in the debasement of the human singing voice.
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