I don’t know what song they’ll play when Kamala Harris takes the stage to deliver her acceptance speech tonight – the smart money would be on Beyonce – but they could do worse than this empowerment ballad. Alicia Keys made it the title track of her 2012 LP, and it’s one of the tunes the campaign plays at rallies. Besides, Keys could use a good career turn. Her guest appearance at Usher’s Super Bowl halftime show this year went awry when her voice cracked as she started singing.