I've always had a soft spot for Bonnie Tyler's "Total Eclipse of the Heart". It combined traditional Jim Steinman anthemic passion with the best of eighties excess, and managed to be sad and moving at the same time.
Then it became a staple of the end-of-year SFSoc weekend at university, with a mash-up video of classic Dr Who scenes (tragically still not available on YouTube, as far as I can tell), so it also became associated with the bitter-sweet end of term feeling that you were saying goodbye to your friends, even if you were going to see them again in September.
And now I like it even more. Cue the Literal Video Version.