Today, we ask what the music of Pharrell Williams, OutKast, and The Strokes can tell us about happiness. Is it just a matter of what happiness means to you, or is there something more to it, perhaps something social? How many kinds of happiness are there? We interview students and sociologist Nicholas Hill to find out what they think. Finally, we tell you why Nina Simone, David Bowie, Kate Bush, and Sly Stone make us happy.