Strilliterate
When someone is utterly inept at producing anything that could be considered musical from a stringed instrument (such as a banjo, cello, guitar, harp, lute, ukulele, violin, etc.). This applies to those whose musical repertoire extends no further than the one time they learned how to play a Nintendo game's theme song from a Youtube video.
"I mean, I can play 'Twinkle Twinkle Little Star', but other than that, I'm strilliterate."
"I DO know how to play more than 'Gerudo Valley'. Come on, I'm not strilliterate!"
"I DO know how to play more than 'Gerudo Valley'. Come on, I'm not strilliterate!"