A# Dominant 13th (A#13) — Complete Guitar Chord Guide Overview A# Dominant 13th is a extended chord built on the root A#. The notes are A#, D, F, Ab, C, F#, following the formula 1 - 3 - 5 - b7 - 9 - 13. This chord is essential for guitarists exploring Jazz Standards, Bebop music and appears in countless songs across multiple genres. The Dominant 13th quality gives it a distinctive harmonic character that provides sophisticated color. Music Theory The A# Dominant 13th chord uses the interval formula 1 - 3 - 5 - b7 - 9 - 13, producing the Root (1), Major Third (3), Perfect Fifth (5), Minor Seventh (b7), Major Ninth (9), Major Thirteenth (13). The notes A#, D, F, Ab, C, F# define its unique sonic footprint. Constructing this chord begins with the A# major scale (A# C D D# F G A). Stacking thirds beyond the seventh adds upper tensions. Playing Tips For advanced level players, A#13 requires advanced finger positioning and voice-leading awareness. Explore inversions, extensions, and substitutions to fully exploit the chords harmonic potential. Musical Applications A# Dominant 13th is most commonly found in Jazz Standards, Bebop, Advanced music. Typical uses include adding sophisticated harmonic color in jazz, fusion, and contemporary contexts. Common chord progressions include . Practice Recommendations Start with 5-minute sessions focusing on clean articulation of each note. Gradually increase to 10-minute transition drills with a metronome, then 20-minute arpeggio and rhythm variation practice. At 30 minutes, apply the chord to full progressions at increasing tempos. Record your practice to identify areas for improvement.