There is a tradition in some forms of yoga to perform 108 sun salutations on the winter solstice.  That's the day with the shortest period of sunlight (in the northern hemisphere anyway).  So a bunch of yoga students get together and do all these active poses, right?  Well, you need to have a soundtrack.  What songs do you include in your playlist?  Well, what better tune for the darkest day of the year than Stevie Wonder's "You Are the Sunshine of my Life" ?