I was thinking about this recently, and was wondering what everyone thinks the greatest song in the history of music is. I personally think it's Stairway to Heaven by Led Zeppelin. From the poetic storytelling nature of the lyrics to the ease and passion of the guitar solo to the dramatic development of the song itself, it gets my vote. I'd say it's the best rock song of all time, but greatest song of all time might be a tough vote for some other people.