premise: A couple walks down the street holding hands while a man plays music. hypothesis: A man and his girlfriend are taking a romantic walk.
neutral: The couple in question could simply be walking down the boardwalk to get a burger or ride a ride, get an ice cream cone or simply enjoy the sight of the sea at sunset. There is no implication of romanticism in the walk they are taking, they could be arguing while holding hands for all we know from sentence 1.