Recent 34++ Capo For 3/4 Acoustic Guitar. Capo is a tiny device that clamps with the neck and raise the pitch of the guitar. Among the 15 best capo for acoustic guitar, you can pick anyone for usage. A capo, or capo tasto in full length, is a device used for change the key without changing the tuning. In this video i talk about what my favorite capo is for the acoustic guitar.