All products featured on WIRED are independently selected by our editors. However, when you buy something through our retail links, we may earn an affiliate commission. If you're a guitarist, you've ...

Capos. They’re the reason behind the adage 3 chords and the truth. If you’ve got a guitar and you know 3 chords, you can play songs in 10 times as many keys. All you have to do is put a capo behind ...