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A singer is a type of musician who uses his or her voice to produce music. Usually, singing refers to vocal melody only, though vocalist is a similar term which also encompasses non-melodic sounds and effectively includes anyone using their voice as part of a musical composition, including spoken word, Death grunt and rapping.
A lead singer (in barbershop music simply called a lead) is one who sings the primary vocals of a song, as opposed to a backing singer who sings backup vocal(s) to a song or harmonies to the lead singer. An exception is in five-part gospel a cappella music, where the lead is the highest of the five voices and sings a descant, never the melody which may be in any of the other four parts.
In European classical music and opera, voices are treated just like musical instruments. Composers write music for these instruments, understanding the skills and vocal properties of the singers. Singers build careers by specializing in certain musical styles.
To help both composers and singers, voice classification systems evolved, of which there are now many systems. How loud or how fast a singer can sing can be taken into account, while some systems include non-musical characteristics like what a singer looks like, how well a singer acts (crucial in opera), or how funny a singer can be. In Germany, opera houses use a complex sorting procedure, called the fach system, that considers all these elements.