Devices for altering an acoustic property of stringed instruments are described that include a tailpiece adjustment mechanism configured for rotating at least a portion of a tailpiece relative to a central axis of the stringed instrument, and/or for immobilizing at least a portion of a tailpiece such that at least a portion of vibrations of the tailpiece are restrained when the stringed instrument is played, and/or for transmitting at least a portion of vibrations produced in a tailpiece when the stringed instrument is played into a body portion of the stringed instrument. Stringed instruments containing such devices and methods for altering an acoustic property of stringed instruments are also described.