How should I analyse this chord progression: Fm D♭ E♭ B♭ ?
Is it (in A♭ major): vi IV V II ?
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It is unlikely that this is Ab major because the progression doesn't have an Ab major in it and also doesn't typically have a Bb chord. If it has a Bb chord it is usually followed by a Eb chord as the Bb chord will function as a secondary dominant in the key of Ab major not II.
I see it as a progression in F minor as a
i VI VII IV. The IV is technically not from F minor, but could have easily been taken from the relative major. Another possibility I see is the chord progression being in Eb major as a
ii bVII I V.
Without seeing more of the piece, I would lean towards Eb major or F minor over Ab major.
E flat major. That is the key that the passage resolves to, as you can hear by playing an E flat major chord after the B flat chord. If you follow the B flat with any of the other chords, the passage is left sounding unresolved.
Hence, the chord progression is ii,flattened VII, I, V