voice classification systems have been used too rigidly, i.e. a house assigning a singer to a specific type and only casting him or her in roles they consider belonging to this category.While choral singers are classified into voice parts based on their vocal range, solo singers are classified into voice types based more on their tessitura - where their voice feels most comfortable for the majority of the time.

A singer will ultimately choose a repertoire that suits their instrument. Some singers such as Enrico Caruso,