About the Asus2 chord
To play A suspended 2nd, use the first shape above. Place your index finger on the 4th fret of the G string and your middle finger on the 4th fret of the C string. Leave the E and A strings open. Strum all four strings and check that each one rings cleanly.
Root
A
Quality
Suspended 2nd
Notes
A · B · E
How the Asus2 chord works
A
Root(1)
The home note. It gives the chord its name.
B
Major second(2)
An open-sounding second that replaces the third.
E
Perfect fifth(5)
Adds strength and stability.