A Major 13th (Amaj13) — Complete Guitar Chord Guide Overview A Major 13th is a extended chord built on the root A. The notes are A, C#, E, G#, B, F, following the formula 1 - 3 - 5 - 7 - 9 - 13. This chord is essential for guitarists exploring Jazz Ballads, Contemporary music and appears in countless songs across multiple genres. The Major 13th quality gives it a distinctive harmonic character that provides sophisticated color. Music Theory The A Major 13th chord uses the interval formula 1 - 3 - 5 - 7 - 9 - 13, producing the Root (1), Major Third (3), Perfect Fifth (5), Major Seventh (7), Major Ninth (9), Major Thirteenth (13). The notes A, C#, E, G#, B, F define its unique sonic footprint. Constructing this chord begins with the A major scale (A B C# D E F# G#). Stacking thirds beyond the seventh adds upper tensions. Playing Tips For advanced level players, Amaj13 requires advanced finger positioning and voice-leading awareness. Explore inversions, extensions, and substitutions to fully exploit the chords harmonic potential. Musical Applications A Major 13th is most commonly found in Jazz Ballads, Contemporary 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.