E, B, Bb, A
It's easy enough to know where to place them.
I think this might be the lead that is played over the B, Bb and A chords:
E|---7/6---6/5---5/4---------------|
B|---7/6---6/5---5/4---------------|
G|---8/7---7/6---6/5---------------|
D|---------------------------------|
A|---------------------------------|
E|---------------------------------|