David Freiberg (pronounced FRY-BERG) (born August 24, 1938) is an American musician best known for contributing vocals, keyboards, electric bass, rhythm guitar, viola and percussion as a member of Quicksilver Messenger Service, Jefferson Airplane, and Jefferson Starship. Among other tracks, he co-wrote “Jane,” a hit for Jefferson Starship.

Classically trained in violin and viola, Freiberg began his career moonlighting as a coffeehouse singer-songwriter (playing acoustic guitar) during the American folk music revival while working for a railroad. For a while, he shared a house in Venice, California with David Crosby and Paul Kantner  before being briefly jailed for marijuana possession. Prior to being incarcerated, he also became acquainted with Dino Valenti, then Crosby’s nominal roommate on a houseboat in Sausalito, California. During his time as a coffee house folk singer, he was part of the duo David & Michaela. David & Michaela made a demo at CBS studios, and “Elektraproducer Paul Rothchild proposed fitting them into a bigger folk group. But the onset of the Beatles spelled the end of David & Michaela, and incentive for Freiberg to switch to rock and electric instruments.