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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. G sharp
    4. Major ninth sharp eleventh

    G sharp Major ninth sharp eleventh

    Major ninth with ♯11 (1–3–5–7–9–♯11); Lydian brightness on major harmony.

    majormaj9♯11Δ9♯11^9♯11

    Guitar diagrams

    Piano voicings

    Which intervals and notes are in the G sharp Major ninth sharp eleventh chord?

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

    To which mode does G sharp Major ninth sharp eleventh belong?

    Parent scales and degrees where this chord appears as a diatonic sonority.

    Which scales can you play on the G sharp Major ninth sharp eleventh chord?

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

    Practice the major ninth sharp eleventh chord

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    Practice the major ninth sharp eleventh chord

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    Learn music theory with sonid

    Available on Android and iOS

    The major ninth sharp eleventh chord extends maj9 with a raised eleventh (1-3-5-7-9-♯11). The ♯11 is the same pitch class as ♯4, giving a classic Lydian color: floating, modern, and very common in jazz and contemporary film music on Imaj♯11 or IVmaj♯11 contexts.

    Construction

    Start from maj9 and add ♯11. In Cmaj9(♯11), ♯11 is F♯.

    Usage

    Lydian vamps, jazz tonic colors, and pop production for “wide sky” major moods.

    Examples

    • Modal jazz tunes on major or IV chords
    • Film scoring for wonder and openness
    • Neo-soul keys parts with quartal upper structure

    Play

    Keep the major third clear; voice ♯11 high; omit the fifth if needed.

    Ear-training cues

    Major ninth sound with a Lydian ♯11 sparkle on top.

    NameAliasesDifficulty
    G sharp Lydian-Beginner
    G sharp Chromatic-Easy
    G sharp Messiaen's mode 3-Guru
    G sharp Ichikosucho-Guru
    IntervalsemitonesNote
    Perfect unison0G♯
    Major third4B♯
    Perfect fifth7D♯
    Major seventh11F𝄪
    Major ninth14A♯
    Augmented undecime18C𝄪
    NameAliasesDifficulty
    G sharp MajorM, ^, , majBeginner
    G sharp Major seventhmaj7, Δ, ma7, M7, Maj7, ^7Beginner
    G sharp Fifth5Beginner
    G sharp Suspended secondsus2Beginner
    G sharp Major ninthmaj9, Δ9, ^9Easy
    M9b5Easy
    M7b5Intermediate
    Madd9, 2, add9, add2Intermediate
    maj#4, Δ#4, Δ#11, M7#11, ^7#11, maj7#11Intermediate
    Mb5Guru
    G sharp Major ninth flat fifth
    G sharp Major seventh flat fifth
    G sharp Major add ninth
    G sharp Major sharp fourth
    G sharp Major flat fifth

    DegreeTriadSeventhExtendedScale
    I
    II
    III
    IV
    V
    G♯
    13
    G♯
    9
    G♯
    7no5
    G sharp Mixolydian
    VI
    G♯
    m
    G♯
    m7
    G♯
    m9
    G♯
    m11
    G♯
    madd9
    G sharp Minor
    VII
    G♯
    m7♭5
    G sharp Locrian
    G♯
    M
    G♯
    maj7
    G♯
    maj13
    G♯
    maj9
    G sharp Major
    G♯
    m
    G♯
    m7
    G♯
    m9
    G♯
    m11
    G♯
    m13
    G♯
    m69
    G sharp Dorian
    G♯
    m
    G♯
    m7
    G♯
    m
    G sharp Phrygian
    G♯
    M
    G♯
    maj7
    G♯
    M13♯11
    G♯
    maj9♯11
    G sharp Lydian
    G♯
    M
    G♯
    7