tenor, highest male vocal range, normally extending approximately from the second B (B₂) below middle C (C₄) to the G (G₄) above. The range of a tenor, however, may extend slightly lower or higher. An extremely high voice, extending into the alto range, is usually referred to as a countertenor. The low end of tenor repertoire may sometimes drop below B₂. In instrument families, tenor refers to the instrument of more or less comparable range (e.g., tenor horn).

In the polyphonic (multipart) music of the 13th–16th century, tenor referred to the part “holding” the cantus firmus, the plainsong, or other melody on which a composition was usually built. The highest line above was known as superius (the modern soprano), and the third added voice was contratenor. In the mid-15th century, writing in four parts became common, and the contratenor part gave rise to the contratenor altus (the modern alto) and contratenor bassus (the modern bass). The term tenor gradually lost its association with a cantus firmus and began to refer to the part between the alto and bass and to the corresponding vocal range.

There are various types of tenor voices, which may be classified as dramatic, leggero (tenore di grazia), lyric, heroic (heldentenor), Mozart, spieltenor (tenor buffo), or spinto. In plainsong recitation of psalms, tenor refers to the reiterated note on which most of the syllables fall.

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