I can't understand what a 5 chord is, for example "G5"

Any help???

Thanks =]
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It's an interval consisting of a root and a fifth. If you don't know what that means, you need to read the theory sticky and the crusade articles.
Someones knowledge of guitar companies spelling determines what amps you can own. Really smart people can own things like Framus because they sound like they might be spelled with a "y" but they aren't.
A "powerchord" essentially.

Epiphone Les Paul Standard w/ SD Alnico Pro II's
Fender Aerodyne Telecaster & Stratocaster
Marshall JCM 800 4104 combo

E-Married to Funny_Page
it is a "power chord" just consists of the root and the fifth. G being the root and 5 being the 5th above the root.
a power chord and to play one:

1. start with a root note on the 6th, 5th or 4th string

2. play the note one string up and two frets up with it and there you go. a fifth chord!

for example:
Ibanez RG350DX
Line 6 Spider III
Cubase SX3
Sometimes a fifth (or power) chord is also played with the octave of the root note, which is essentially 2 frets and 2 strings higher.