According to Marceline, "It can play the most savory music in Ooo." Marceline gets this bass at the end of her short in the episode "Five More Short Graybles" from the shopkeeper Wizard Bill. As seen in the pic, the guitar appears to have a sword stabbed through it with a demon-like center with veins and horns.
.png "Five More Short Graybles (7).png (185 KB)")
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