Capo

A capo clamps across all six strings at a chosen fret, acting like a moveable nut and raising the pitch of every open string by however many frets it's placed. This lets a guitarist keep using familiar, comfortable open-chord shapes while actually playing in a different key — useful for matching a song's original key, transposing to suit a singer's vocal range, or simply getting a brighter, more resonant open-string sound than the equivalent barre chords would give. It's one of the cheapest, most useful accessories a guitarist can own.

Types

• Spring-loaded/trigger capo — squeeze to open, clamp shut, and release — the fastest and most common design for quick changes.
• Strap/elastic capo — a simple strap-and-bar design, lightweight and inexpensive but slower to adjust.
• Screw/adjustable-tension capo — a screw mechanism lets you fine-tune clamping pressure, useful for guitars with unusual neck profiles or for reducing tuning issues.
• Partial capo — covers only some of the strings, used for altered-tuning-like effects without retuning the guitar.

How to use it

1. Decide which fret to place the capo on based on the key you want — each fret raises the pitch by one half-step.
2. Position the capo just behind the fret wire (on the headstock side), not directly on top of it, for the cleanest tone without buzzing.
3. Clamp evenly so all six strings ring clearly; check by playing each string individually.
4. Retune if needed — capos can very slightly pull strings sharp, especially if clamped too hard.
5. Use a capo chart or simple half-step counting to figure out which fret reproduces a target key, then play your familiar open-chord shapes as normal above the capo.

Care

Store the capo in your case or gig bag pocket when not attached, and avoid leaving it clamped on the guitar for extended periods of non-use, since constant string tension at a fret isn't necessary and can be avoided.