You have 24 hours to live and have to choose one song to listen to for the entirety. Give me 'Piano Man.' Go.
Beethoven's Ninth Symphony (if eligible, as technically it is not a song). Otherwise, I would have to say "Battle of Evermore" by Led Zeppelin.
Was going to post the same earlier. That synth line never gets old! Strategically, I'd think you'd want to go with something without lyrics and relatively laid back. Screw it, I'll take the Super Mario theme song. Spend a lot of time jumping on random shit and picking up loose change.
That's a tough one. I too could go with Beethoven's Ninth, specially if it could be the CD of the Illinois State Symphony with my daughter playing the lead solo on Oboe. Otherwise I think I would go with either Bohemian Rhapsody by Queen or The Anchor Holds by Ray Boltz.