Hi i dont even know what you call it, when a chord is written like G/F# how is that derived, its like half of one chord and half another but i dont understand it. Could someone explain this simply for me. Or link me something that can, thank you
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When you see a chord like that, you play the chord of G with a root note F#. (If you had Am/G, you would play A minor with a root note G; if you had C7/F, you'd play C7 with a root note F, etc...) So the chord would be played 220003 (or 220033, or 255433...), EADGBe.

EDIT: Jwaxman, you have it backwards.
Yeah still dont get it, i knew that part about the root note but i dont understand how you got from there to there?
Someones savior never saved. Burn the Heretics, purge the witches...
Well, you have the G chord (3,2,0,0,0,3), and the slash basically means you play the note afterwards (in this case the F#) as the root of the chord, so you could play it as 2,2,0,0,0,3, 2,x,0,0,0,3 or x,x,4,0,0,3. Each of those chords contain the notes that make up the G chord (G, B, D), but instead of having the G as the root (3 on the E string), you replace it with the F#.

Some chords like C/G can have it played as 3,3,2,0,1,0 so that you just put the G note ontop of the original chord. So you don't always have to replace the original root note (3 on the A string) to play a slash chord.

Hope that helps your understanding a bit.
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