Capo (musical device)
A capo ( KAY-poh, KAH-; short for capodastro, capo tasto or capotasto [ˌkapoˈtasto], Italian for "head of fretboard") is a device a musician uses on the neck of a stringed (typically fretted) instrument to transpose and shorten the playable length of the strings—hence raising the pitch. It is a common tool for players of guitars, mandolins, mandolas, banjos, ukuleles and bouzoukis.