Disclosed are apparatus and related methods for adjusting the pitch of a string on a stringed instrument. In one embodiment, the disclosed devices enable a musician to adjust the tautness and, accordingly, the pitch of individual strings of a stringed instrument by simply pushing a lever or rotating a threaded piston or on or adjacent to the bridge of the guitar. The disclosed devices can preferably be outfitted on electric or acoustic stringed instruments, including guitars. The more specific aspects of the preferred embodiments are discussed in greater detail with reference to the figures.