Here is a shape for the A sharp / B flat major guitar chord. This chord diagram uses one of the more common bar chord voicings. The lowest root note of this chord is the A# / Bb on the 1st fret of the 5th string. When a note can be called by more than one name, in this case A sharp or B flat, that note is said to be enharmonic. This can be one of the more difficult bar chords to play. If you need more help on playing bar chords you can always go to the bar chord lesson page.