I have been thinking about this question all day, I am having such a hard time with it. I have too many favorite songs!
I would have to say my favorite song on the moment is Airplanes by B.O.B. It pretty much sums up how I am feeling about my IF right now.
My favorite old song is my wedding song - Just The Way You Are by Billy Joel. B has been a pretty amazing and supportive husband through this whole IF journey and am so glad he loves me just they way I am ( since I have been pretty hormonal and crazy lately!)