Assertion: tremolo | /r/CapableOf | call a whammy bar
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text: A tremolo arm or tremolo bar (also called a whammy bar or whowy 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.