Capo is a real word. Besides meaning "trustie" or "trustee" (a prisoner who acts as the guards' assistant) in a prison in NA, SA, & Europe, it is the name for a clip-on fret bridge to scale up a stringed instrument, i.e., for a guitar, banjo, or ukulele, and they make one for bowed instruments, too. I had a capo for my viola. Used it once in a practice session in high school orchestra. Billary is complete and utter cack. Not even Apple's Siri would auto correct to that. I bet the post is written by a Bogan Aussie, Hoser Canuck, Wigham Brit, or Redneck from the Flyover States of America. No immigrant status needed to explain that level of illiteracy.