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"Guitarache" is an Electronic Rock remix and mashup of "Heartache" from Undertale and the scrapped "Skyborn Rocking". The track would play during the fight with Endigo Skyborn on Neutral and Pacifist Routes before being replaced with "Heartbass". It was released on September 13, 2016 along "DnB-Trousle" and "Once Upon an Acapella".