The ebow ( Energy bow), is a small, hand held device that 'bows' the strings of a guitar using an electromagnetic field. It produces a unique guitar sound, with a very slow attack and infinite sustain.

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Acoustic and Electric Guitars
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To play the ebow, the guitarist holds it over the string, near the pickup or hole, so that the string sits in a small notch on the underside of the eBow. The eBow's magnets then cause the string to vibrate until it feeds back on itself at its own resonant frequency. This feedback loop is very similar to the well-known amplifier feedback, but a much more controllable version. The player can vary the loudness of the sound by moving closer or further away from the string, as with amplifier feedback. The ebow is switchable from low power mode to high power mode, which gives a strong, harmonically rich sound.

The ebow has been used at one time or another by nearly every guitarist under the sun : Radiohead, Tom Petty, Dave Gilmour, Sigur Ros, NIN, Coldplay, Smashing Pumpkins, The Cure, REM, U2, etc etc...