There is some confusion with modern players in that a modern Boehm keyed system flute is typically pitched in C. This is due to the added keys that allow one to reach low C, yet when one covers just the six main finger-holes (with thumb key covered) on a modern metal Boehm system flute, (XXX-XXX) the note achieved is D. For many technical reasons, a simple system D wooden flute more closely mirrors a concert C modern Boehm system flute in the pitches achieved in its fingering positions as opposed to a simple system flute pitched in C. Theobald Boehm completely redesigned the flute to more easily access the chromatic scale. The Boehm flute has a cylindrical bore (with a parabolic bore in the head) and uses keys to enable the tone holes to be in the ideal place and to be of the ideal size.