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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. B
    4. Major ninth sharp eleventh

    B Major ninth sharp eleventh

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

    majormaj9♯11Δ9♯11^9♯11

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

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

    To which mode does B Major ninth sharp eleventh belong?

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

    Which scales can you play on the B 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.

    B 5
    B M
    B M7♭5
    B M9♭5
    B Madd9
    B M♭5
    B maj♯4
    B maj7
    B maj9
    B sus2
    B Chromatic
    B Ichikosucho
    B Lydian
    B Messiaen's mode 3
    IntervalsemitonesNote
    0B
    4D♯
    7F♯
    11A♯
    14C♯
    18E♯
    Perfect unison
    Major third
    Perfect fifth
    Major seventh
    Major ninth
    Augmented undecime

    DegreeTriadSeventhExtendedScale
    I
    II
    III
    IV
    V
    VI
    VII

    These modes come from a defined series of intervals! Checkout our blogpost about the major modes!

    M
    maj7
    maj13
    maj9
    Major
    m
    m7
    m9
    m11
    m13
    m69
    Dorian
    m
    m7
    m
    Phrygian
    M
    maj7
    M13♯11
    maj9♯11
    Lydian
    M
    7
    13
    9
    7no5
    Mixolydian
    m
    m7
    m9
    m11
    madd9
    Minor
    m7♭5
    Locrian