The term Tenor derived from the latin verb tenere, meaning 'to hold' and is the highest natural male voice with an approximate range of two octaves, usually starting at C below Middle C.medieval times, the tenor part was so named because it held the basic melodic line, which was then furnished by countermelodies from other singers. Today, the most commonly used categories of tenor are the dramatic tenor, otherwise known as the robust tenor, and the lighter, more agile lyrics tenor.