How does Alberta influence the other characters in Fences?

I think that Alberta wields influence over Troy and Rose,
and is more representative of what Bono would call “the walking blues” to the other
characters.  She is the other woman for Troy, and represents, to a great extent, his own
discontent with his marriage and familial commitments.  Troy’s relationship with her is
more of an escape from his own condition.  Rose is impacted by Alberta in her being “the
other woman, “ a force that changes one’s condition in life as a wife.  At the same
time, Rose takes care of Alberta’s child who is orphaned after her death in child
birth.  In this, Rose is impacted by Alberta even after her death.  I think that the
other characters experience a tangential effect of Alberta.  Alberta does not seek to
impact any of them, and, to a great extent, she probably never intended to impact Rose
in the manner she did.  Bono views Alberta as representative of Troy’s inability to make
his life better and the very embodiment of the “walking blues.”  I think that Cory views
Alberta as the physical representation of his father’s inability to make good on his
commitments and promises, something that Cory himself wishes to avoid as a result of his
interaction with his father.