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F-flat major (uncountable)

(music) The theoretical major key with F-flat as its tonic and the notes F♭, G♭, A♭, B♭♭, C♭, D♭, and E♭.

${\key fes \major fes' ges' aes' beses' ces'' des'' es'' fes''2}$
(music) The major chord with a root of F-flat.

<img loading="lazy" src="//upload.wikimedia.org/score/b/d/bdw65cfgljevzvul2md9739xu69yf4r/bdw65cfg.png" width="121" height="52" alt="1">

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