The Bass-baritone reference article from the English Wikipedia on 24-Apr-2004
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Bass-baritone

A bass-baritone is a singing voice with a range lower than a baritone, and slightly higher than a true bass. The term is also used to refer to a singer who possesses such a singing voice.

Well known bass baritones include:

See also: soprano, contralto, tenor, baritone, bass