【How-to】Why does it always rain on me

A#13 Chord On The Guitar (A Sharp 13) – Diagrams, Finger Positions and Theory. The A#13 chord contains the notes A#, Cx, E#, G# and Fx. It is produced by taking the 1 (root), 3 , 5, b7 and 13 of the A# Major scale. It is essentially an A# dominant 7 chord with an added 13.