Today's song is by an amateur musician and professional (academic) economist (a winning combination anytime!), John DiNardo. You can listen to "Non-convex desires" here (in .mp3 format) and you can read an approximation of its lyrics here (compared to the audio version linked above, you will notice some permutation in the early verses, some slightly changed words and the last verse left entirely for future research :-)). The following shall be retained for future reference: "Come on baby won't you share/ your non-convex desires with me".
If you want to find out more John DiNardo-the musician, here's some serious review of his musical production so far. My other favourite piece from him is "(My Little) Regression Discontinuity". Check out also this very very promising duo (composed of John DiNardo and a much better little fellow), excellently covering "What I like about you".