Task: Question Answering
Input (English): Passage: After listening to a morning conversation between Sophie and Simon, Sophie is buying a couch from Alex for her own apartment in working class Echo Park in Central Las Angeles.  Black musician Alex is returning to England after failing to break into films.  Alex invites Sophie to join him, Mateo and his boy, Elias to play soccer in the park.  After Sophie and Alex end up having sex and become friends.
Alex plays the role as rebound guy and Sophie admits she is still in love with her lifetime boyfriend but feels trapped.  Sophie's rich Mom finds her and tells her to go back to Simon because she never dreamed of having Black grandchildren.  Controlling rich Simon keeps telling Sophie to get over this "whatever vacation" and come back to him.
Alex's house sale falls through and Sophie agrees to buy it.  Alex has fallen for Sophie but she does not ask him to stay.  In fact she tells him she is returning to Simon.  His friend Mateo also agrees to reconcile with his wife Martha.  Alex cannot understand why couples reconcile into failed relationships.  Sophie and Simon have a great fun day at a fair but at day's end Sophie knows she does not love him and the relationship really is over.
Alex completes packing to move and drives off to the airport.  He leaves her favorite album in the empty house.  Sophie attends Elias' art show from the photographs he made with the camera she purchased him.  Alex keeps driving to the airport but will he turn around?  He does not. 
Question: Who is the black musician the rebound guy for?
Output (English): Sophie.