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    YoutubeMusic Theory Video SeriesA step-by-step guide to music theory fundamentals. These 60-second videos provide a clear, structured path to understanding how music works, optimized for a full-screen learning experience.YoutubeMusic Theory ShortsMaster music theory concepts in 60 seconds or less. Quick, vertical videos designed to give you essential theory knowledge in a fast-paced, mobile-friendly format.
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    1. Home
    2. Chord Library
    3. A flat
    4. Major seventh sharp ninth sharp eleventh

    A flat Major seventh sharp ninth sharp eleventh

    Major seventh with ♯9 and ♯11 (1–3–5–7–♯9–♯11); dense altered extensions on major harmony.

    majormaj7♯9♯11

    Guitar diagrams

    Piano voicings

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    Practice the major seventh sharp ninth sharp eleventh chord

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    Which intervals and notes are in the A flat Major seventh sharp ninth sharp eleventh chord?

    Intervals from the root that spell this chord and its chord tones.

    Which scales can you play on the A flat Major seventh sharp ninth sharp eleventh chord?

    Scales that contain this chord’s notes and usually fit over it.

    Practice the major seventh sharp ninth sharp eleventh chord

    Open the app and start your daily workout!

    Learn music theory with sonid

    Available on Android and iOS

    The major seventh sharp ninth sharp eleventh chord stacks maj7 with two strongly altered extensions: ♯9 and ♯11 (1-3-5-7-♯9-♯11 as a conceptual set). It is not a everyday diatonic chord; it behaves like a composed polychord color or a modern jazz voicing choice on major pedals (sometimes related to split-scale or hybrid-scale thinking). Expect a bright, biting, chromatic surface—excellent for short dramatic moments when a plain maj7 is too tame.

    Construction

    Begin from maj7 and add ♯9 and ♯11 above the bass. Exact voicing determines which intervals listeners notice first.

    Usage

    Film scoring, modern jazz reharmonizations, and experimental pop production on static major centers.

    Examples

    • Climax chords in cinematic cues
    • Modern jazz voicings on Imaj7 with Lydian/altered upper structures
    • Keyboard pads that need maximum chromatic tension
    NameAliasesDifficulty
    A flat Chromatic-Intermediate
    A flat Lydian sharp ninth-Guru
    A flat Messiaen's mode 3-Guru

    Play

    Thin the voicing; separate ♯9 and ♯11 registrally; omit the fifth if needed.

    Ear-training cues

    Major seventh stability with chromatic upper extensions that create sharp, modern dissonance.

    IntervalsemitonesNote
    Perfect unison0A♭
    Major third4C
    Perfect fifth7E♭
    Major seventh11G
    Augmented ninth15B
    Augmented undecime18D
    NameAliasesDifficulty
    M, ^, , majBeginner
    m, min, -Beginner
    5Beginner
    dim, °, oBeginner
    maj7, Δ, ma7, M7, Maj7, ^7Easy
    A flat Minor major seventhm/ma7, m/maj7, mM7, mMaj7, m/M7, -Δ7, mΔ, -^7, -maj7Intermediate
    A flat Major seventh flat fifthM7b5Expert
    A flat Major sharp fourthmaj#4, Δ#4, Δ#11, M7#11, ^7#11, maj7#11Expert
    A flat Diminished major seventhoM7Expert
    A flat Major flat fifthMb5Guru
    A flat Major
    A flat Minor
    A flat Fifth
    A flat Diminished
    A flat Major seventh