Pilotwings 64

Pilotwings 64 is one of the three (two in the US) launch titles for the Nintendo 64, where your job is to... fly around.

Unused Bird Man Ending
For some reason, a mission-ending song exists for the Bird Man mode. You cannot actually end this mode without quitting via the menu, as it's a free-flight mode. What this implies is unknown; perhaps there were once playable missions for Bird Man mode.