Alto
Part of speech: noun
Definition: musical part or section higher than tenor and lower than soprano. Originally called contratenor altus, high countertenor, the part that performed a countermelody above the tenor or main melody. person or instrument that performs the alto part
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Contralto
Part of speech: noun
Definition: the lowest female voice or voice part, higher than tenor and lower than soprano. The terms contralto and alto refer to a similar musical pitch, but among singers, the term contralto is reserved for female singers; the equivalent male form is counter-tenor. Originally the contratenor altus was a high countermelody sung against the tenor or main melody.