B7 Guitar Chord Information
The chord symbol B7 indicates that a B dominant seventh chord should be played. B7 chords are made up of four notes, B, D#, F# and A, in various combinations. Most B7 guitar chord shapes (including the three shapes below) contain all four of these notes, but occasionally B7 chord shapes may omit the F# or the B itself (this most often occurs in specialist jazz chord voicings).
B7 Guitar Chord Diagrams
The most commonly-used B7 chord guitar shape is this open position version:

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Other versions of the B7 guitar chord require a barre (i.e. the index finger of the fretting hand holds down more than one note):


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thanks I need more posture of b7