I thought this would be a fun topic to start. This can be a Blitz pack song, an export song or a DLC song. This would be your late-night session-ender encore song. It doesn't have to be your highest scoring song but the song you have had the most fun playing.
For me it is a tie between Scarlet Begonias (my fav Grateful Dead song) or Heartbreaker by Pat Benatar.