can slightly drop the pitch of all the others—a problem not present on fixed-bridge instruments. One after-market tool, the Tremol-No, temporarily locks the vibrato mechanism. Two thumbscrews let a player choose between completely locked, downwards pitch only, or normal free movement. One of the guitarists who was well known for using this gadget is Guthrie Govan, who had it as a standard feature on his signature guitar models from Suhr Guitars. He has however since moved to Charvel guitars, and appears to have dropped it from his specs. A few vibrato system designs also have various ability to "lock" the system's action: Steinberger TransTrem, Ibanez Edge Zero, Fender Floating/Jaguar/Jazzmaster, and the ChordBender. Many vibrato systems can be set up in such a way that they allow for changing string pitch both up and down. Eddie Van Halen prefers instead to have his set up so it is flush with the guitar body, which has two advantages: first, a broken string doesn't effect the pitch of the other strings, and it can accommodate attachment of a device called a D-Tuna to the bridge. This device can drop the low E-string down a whole step to D to extend the tonal variety of the guitar, even during live performance. Examples Notable tracks Jimmy Shirley's 1945 recording "Jimmy's Blues" is an early recorded example of the Kauffman Vibrola. The electric guitar is an instrument of unique sounds. A vibrato bar enables the guitarist to completely detune the instrument and pull it back on the fly. Many notable guitar players have used this effect over the years. Early in electric guitar history, Chet Atkins favored the Bigsby unit, and it can be occasionally heard in a number of his recordings. Generally, Atkins used the Bigsby just to "dip" chords. His 1978 recording of "It Don't Mean a Thing (If It Ain't Got That Swing)" with Les Paul (another Bigsby user) is a typical example of how Atkins used the device. Surf and early rock instrumental guitar is synonymous with vibrato use. Duane Eddy established the "twangy guitar" sound with a Bigsby vibrato on his Gretsch guitar. Classic examples of this are his recordings of "Rebel Rouser" and "Peter Gunn". Both "Perfidia" and "Walk, Don't Run" by the Ventures are also typical examples. Lonnie Mack's "Wham!" (1963) is said to have inspired the nickname "whammy bar". According to Neil Young, who, like Mack, favors the