To play the Csus chord, place the index finger on the 1st fret of the E-string and ring finger on the 3rd fret of the bottom A-string. Let the other strings ring open.
The Csus chord contains the notes C-F-G.
In this case, the "sus" in the chord name, which means suspended is referring to a "sus4" note.
To build a Csus chord, take the suspended fourth chord formula (1-4-5) and apply it to the C major scale (C, D, E, F, G, A, B).
Identify the first, fourth, and fifth scale degrees in the C major scale which are C-F-G, which gives you a Csus chord.
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