OK so I kinda stumbled on this one day..I played a D chord and my friend played F#m and the chords harmonized together. The sound was really full and i was amazed. I want to know more about harmonizing guitar parts together, so I can add the effect to the music in my band.

An example of where I saw guitar harmonizing was the Strokes song "under control". I know alot of people don't like the Strokes, I'm not to keen on them, but this song is actually very good and the guitars sound really good.

If someone good eduacte me or send me in the right direction that'd be great.