My iTunes Music Store Gift Card (courtesy of Dr. Paul) is burning a hole in my nano. But I’m overwhelmed by the choices. So I’m asking readers of smays.com to help me select 15 great songs. So here’s the assignment: If you could only purchase one song from iTunes, what would it be? Just post it in the comments below. Please don’t attempt to explain your recommendation, just go with title and artist. We’ll wrap this up on March 31st.