<P> In music, there are Head of David's "Dog Day Sunrise", covered by Fear Factory in 1995; Florence and the Machine's 2009 "Dog Days Are Over"; and Within Temptation's 2013 "Dog Days". </P> <P> "Dog - day" promotions are also a common feature in baseball, used by American ballparks to boost ticket sales during mid-afternoon games . </P>

Where did the term dog days come from