What is the differene between a tremolo bar and a whamy bar?
A tremolo arm, tremolo bar, vibrato bar, whammy bar, or twang bar is a lever attached to the bridge and/or the tailpiece of an electric guitar or archtop guitar to enable the player to quickly vary the tension and sometimes the length of the strings temporarily, changing the pitch to create a vibrato, portamento or pitch bend effect. Instruments without this device are called hard-tail. The term vibrola is also used by some guitar makers to describe their particular tremolo arm designs.
