That’s a tough question, because listening to only one song, no matter what it is, will likely drive you crazy. I love rock music, but if I could only listen to one song repeatedly, it would have to be something more soothing. Therefore, I would go with Elizabeth Schwarzkopf’s rendition of “Barcarolle” from Offenbach’s opera “Les Contes d’Hoffmann” or Beethoven’s “Moonlight Sonata”.
If I had to pick one favorite song (which is really hard because I have a 100 of them) it would be “Count On Me” by Jefferson Starship. It’s one of the only songs that has stayed on my MP3 since I got it two years ago.
When I was studying in law school and for the bar exam, I played Pearl Jam’s “Hard to Imagine” on repeat for hours at a time. I still do it when I need to concentrate, and I am still never sick of that song.