Minor blues in B♭ minor

i7 – i7 – i7 – i7 – iv7 – iv7 – i7 – i7 – ♭VI7 – V7 – i7 – V7: B♭m7 → B♭m7 → B♭m7 → B♭m7 → E♭m7 → E♭m7 → B♭m7 → B♭m7 → F#7 → F7 → B♭m7 → F7