This is what Shaggy can do using a small percentage of his power. Using more than 1% could be harmful to the guitar. At 1% of his power he can play guitar with the ultra instinct.
Ultra Instinct Shaggy is an Ultra Instinct Remix featuring the character Shaggy from Scooby-Doo undergoing the “ultra instinct” transformation of Goku from Dragon Ball Super. After an Ultra Instinct Remix featuring Shaggy grew popular, the character developed a fandom online.