"Theme From 'Shaft'" (1971): He's a bad mother ... so how do you NOT choose this song among the top five? It has such great energy and is such a fabulously funky reflection of its time: the horns, the driving chicka-chicka, the staccato strings. Isaac Hayes is at his smooth, soulful best here, crooning lyrics that seemed so racy in their day about Richard Roundtree's character, "the black private dick that's a sex machine to all the chicks." This was a bold pick from the Academy, and it made Hayes the first black person to win an Academy Award outside of the acting categories. Can you dig it?