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"The Guitar Triller is an innovative accessory that essentially functions as a guitar hammer that you can use to whack the strings to produce a different kind of sound. Currently the subject of a crowdfunding campaign on Kickstarter, this accessory was inspired by legendary guitarist Steve Vai, who is known to have plucked the whammy bar right out of his guitar before whacking the strings during a solo.  This guitar hammer takes the technique of hammer-ons in a literal sense, and allows you to strike individual or double string targets or all the strings at once for a hammered chord sound. Players can even get creative and use combination of single, double and multiple string hammer-ons, opening a whole new world of musical expression. Just like with conventional techniques, this guitar hammer accessory requires a great deal of patience and practice, but the end results are truly unique from a musical standpoint."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.trendhunter.com/trends/guitar-hammer>