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    1. Home
    2. Chord Library
    3. C
    4. Major seventh sharp ninth sharp eleventh

    C 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 C 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 C 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
    C Chromatic-Easy
    C Lydian sharp ninth-Guru
    C 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 unison0C
    Major third4E
    Perfect fifth7G
    Major seventh11B
    Augmented ninth15D♯
    Augmented undecime18F♯
    NameAliasesDifficulty
    C MajorM, ^, , majBeginner
    C Minorm, min, -Beginner
    C Major seventhmaj7, Δ, ma7, M7, Maj7, ^7Beginner
    C Fifth5Beginner
    C Diminisheddim, °, oEasy
    m/ma7, m/maj7, mM7, mMaj7, m/M7, -Δ7, mΔ, -^7, -maj7Easy
    M7b5Intermediate
    maj#4, Δ#4, Δ#11, M7#11, ^7#11, maj7#11Intermediate
    oM7Expert
    Mb5Guru
    C Minor major seventh
    C Major seventh flat fifth
    C Major sharp fourth
    C Diminished major seventh
    C Major flat fifth