When the terms soprano, mezzo-soprano, contralto, tenor, baritone, and bass are used as descriptors of non-classical voices, they are applied more loosely than they would be to those of classical singers and generally refer only to the singer's perceived vocal range. In non-classical music, singers are defined by their genre and their gender and not by their vocal range. For classical and operatic singers, their voice type determines the roles they will sing and is a primary method of categorization.
The term baritone was developed in relation to classical and operatic voices, where the classification is based not merely on the singer's vocal range but also on the tessitura and timbre of the voice. However, the baritone voice is determined not only by its vocal range, but also by its timbre, which tends to be darker than that of the typical tenor voice. The baritone voice is typically written in the range from the second G below middle C to the G above middle C (G 2–G 4) although it can be extended at either end. This list is incomplete you can help by adding missing items.