odd clips

[ilovewasabi]

i saw this person that was playing a guitar with a clip near the top of his fretboard. what is that for? i'm guessing it's just a cheap way to do barre chords.

[EdZ]

Its called capo. It like shortening the neck on your guitar, gets you different sounds.

[Agalloch]

They are actually very cool to use because they completely change the key/pitch of the guitar.

[ilovewasabi]

how much does it cost? is it worth it?