When is the vocal tenor clef used for?

The vocal tenor clef, which is represented by a stylized letter "C" on the second line of the staff, is primarily used for notating music for tenor voices, particularly in choral and vocal music. It allows the music to be written in a range that is comfortable for tenors, as this clef transposes the notes up a fifth compared to the bass clef. It may also be used for certain instrumental parts, such as those for the bassoon or the euphonium, when they play in the tenor range. This clef helps to avoid excessive ledger lines and facilitates easier reading for musicians.