Adolphe Sax
The subcontrabass saxophone is a type of saxophone that Adolphe Sax patented and planned to build but never constructed. Sax called this imagined instrument "saxophone bourdon" (named after a low pitch stop found on many pipe organs). It is a transposing instrument pitched in B, one octave below the bass saxophone, two octaves below the tenor saxophone, and three octaves and a major second below its written pitch.