About the Csus4 chord
To play C suspended 4th, use the first shape above. Place your index finger on the 1st fret of the E string and your ring finger on the 3rd fret of the A string. Leave the G and C strings open. Strum all four strings and check that each one rings cleanly.
Root
C
Quality
Suspended 4th
Notes
C · F · G
How the Csus4 chord works
C
Root(1)
The home note. It gives the chord its name.
F
Perfect fourth(4)
A suspended fourth that replaces the third.
G
Perfect fifth(5)
Adds strength and stability.