Various tuning and bridge systems for stringed musical instruments are disclosed for facilitating release of the tension on the strings to enable disassembly and removal of the strings from the instrument. In embodiments for release of the strings from individual string holders, the string holders are mounted for pivotable movement, and a latch is provided for holding the string holder against rotation in one direction, the latch being moveable to a release position to permit free rotation to release the string. In embodiments for release of tension on all the strings, a bridge latch is provided for latching the bridge base to the instrument so that the strings are placed under tension to permit play, the bridge latch being moveable to a release position to permit movement of the bridge base to release the tension on all the strings.