There are two or more notes in a chord. Guitar chords usually have three notes... look on wikipedia.com and look up guitar chords or musical chords or somethingPiano chords are usually 3 notes.
The 4 Chords can be the 3 major chords in a key, aka the I IV and V chords and the relative minor aka the vi chord. For the key of C this would be C F G Am. If you know the key, the four chords are...
A chord is formed when multiple pitches (notes on a musical instrument) are placed together on a staff (a sheet of music). Chords come in a lot of different varieties, including (but not limited to):...