% All Along the Watchtower

In: R bVII | $BP*4
BP: i bVII | bVI bVII |     % Occasionally iv7 instead of bVI; at end, sometimes v instead of bVII 
Vr: $BP*8
Solo: $BP*4
Fadeout: $Solo*2
S: [C] $In $Vr $Solo $Vr $Solo*4 $Vr $Fadeout