Adim7 chord
A diminished seventh
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Play Adim7 on ukulele at frets 5-3-2-0 in gCEA tuning.
The Adim7 chord has the formula 1, b3, b5, bb7 with notes A, C, D#, F#
The diminished seventh chord is used in classical and jazz music. It is often formed on the seventh degree and used as a leading-tone chord toward the tonic.