Constance Mary Demby is a U.S. multi-instrumentalist player and composer. Demby is identified with the New Age movement (as both her personal belief and the New Age music style), while some of her output is also classified as ambient or space music. She is also a singer, instrument designer, painter, sculptor, and multi-media producer. She is best known for her 1986 album Novus Magnificat. Constance Mary Demby was born in Oakland, California. She learned to play the classical pianoforte in her childhood and went on to become a multi-instrumentalist (including hammered dulcimer, vocals, synthesizers, and originally-designed custom acoustic instruments).

She studied sculpture and painting at the University of Michigan. It was both as musician and sculptor that her Sonic Steel Instruments, the space bass and the whale sail were created. An original design, her Sonic Steel Instruments have been recorded by Lucas Skywalker Studios for use in their filmscores, and also filmed by Discovery Channel at Gaudi's Park Güell. The Space Bass is featured on Michael Stearns' soundtrack for Chronos.