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IV/IV → IV



Key of C Major:
B♭ [B♭-D-F] → F [F-A-C]



Key of G Major:
F [F-A-C] → C [C-E-G]

Key of D Major:
C [C-E-G] → G [G-B-D]

Key of A Major:
G [G-B-D] → D [D-F♯-A]

Key of E Major:
D [D-F♯-A] → A [A-C♯-E]

Key of B Major:
A [A-C♯-E] → E [E-G♯-B]

Key of F♯ Major:
E [E-G♯-B] → B [B-D♯-F♯]

Key of C♯ Major:
B [B-D♯-F♯] → F♯ [F♯-A♯-C♯]



Key of F Major:
E♭ [E♭-G-B♭] → B♭ [B♭-D-F]

Key of B♭ Major:
A♭ [A♭-C-E♭] → E♭ [E♭-G-B♭]

Key of E♭ Major:
D♭ [D♭-F-A♭] → A♭ [A♭-C-E♭]

Key of A♭ Major:
G♭ [G♭-B♭-D♭] → D♭ [D♭-F-A♭]

Key of D♭ Major:
C♭ [C♭-E♭-G♭] → G♭ [G♭-B♭-D♭]

Key of G♭ Major:
F♭ [F♭-A♭-C♭] → C♭ [C♭-E♭-G♭]

Key of C♭ Major:
A [A-C♯-E]* → F♭ [F♭-A♭-C♭]
* Equivalent to B♭♭