Rednex - "The Sad But True Story Of Ray Mingus, The Lumberjack Of Bulk Rock City, And His Never Slacking Stribe In Exploiting The So Far Undiscovered Areas Of The Intention To Bodily Intercourse From The Opposite Species Of His Kind, During Intake Of All The Mental Condition That Could Be Derived From Fermentation"
Since longest was in the last title, I had to go with the longest song title in recorded music history! Ha ha ha! SERIOUSLY, that whole thing is the title of a song by the Swedish group Rednex! Ha ha ha!