The Noted Neck™ Temporary Tattoos are quite simply the coolest way to learn the guitar. Apply the Noted Neck temporary tattoo to the forearm of the hand that holds and plays the neck of the guitar! (Right or left. Doesn't matter unless it matters to you). With the tattoo applied, you can visually learn and memorize the notes of the guitar in standard tuning! Oh yeah, it looks pretty sweet too! Get some!
US Patent 7767894