These two are the largest, deepest voiced, and rarest recorders in existence today. The contrabass is F fingered and the sub contrabass is C fingered, and their ranges begin at the second F below Middle C (contra) and the C two octaves below Middle C (sub contra.) Pictured above is the sub contra, which stands 8-9 feet tall. Neither of these two recorders is used in the typical recorder orchestra.
contrabass demo tune (it's the same as the greatbass demo tune--this time listen to the lower voice)