% Back in Black

A: I bVII | IV6 |
B: I bVII | IV6 I | I bVII | IV6 . . . I IV . I IV |  % subdivided even lower, but will suffice

In: R |*2 $A*4
Vr: $A*4
Ch: IV I V . | IV I V . | bIII bVII IV . | bIII bVII IV . | IV I V . | IV I V . | bIII | bVII |
So: $B*4
Br: I | | | | IV | | I | | % chords have b3 embellishments
Ou: $B*3 I bVII | IV6 I |

Zz: $Vr $Ch
S: [E] $In $Zz*2 $So $Ch $Br $Ch iv | | $Ou