The difference between Alto and Contralto
When used as nouns, alto means a musical part or section higher than tenor and lower than soprano, formerly the part that performed a countermelody above the tenor or main melody, whereas contralto means the lowest female voice or voice part, falling between tenor and mezzo-soprano. the terms contralto and alto refer to a similar musical pitch, but among singers, the term contralto is reserved for female singers.
check bellow for the other definitions of Alto and Contralto
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Alto as a noun:
A musical part or section higher than tenor and lower than soprano, formerly the part that performed a countermelody above the tenor or main melody.
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Alto as a noun:
A person or musical instrument that performs the alto part.
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Alto as a noun (colloquial, music):
An alto saxophone
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Contralto as a noun (music):
The lowest female voice or voice part, falling between tenor and mezzo-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.