Greatest Song Ever?

Those who know me know I don't watch much TV. But I managed to make time for some quality viewing last night - 20 to 1 Greatest Songs Ever.

I know this must be one of the most subjective lists to compile, and they did cover most of the 'great' artists, including Dylan, the Beatles, Elvis and the Rolling Stones (complete with corny comments and Bert Newton in costume).

I think it was compiled by someone from a previous generation: Like a Virgin, Smells Like Teen Spirit and Sunday Bloody Sunday just made it, but that was about it from recent times. Louis Armstrong, Aretha Franklin, etc. made it much higher.

Led Zep's Stairway to Heaven was beaten by Lennon's Imagine for the top spot - great song, inspiring lyrics, but greatest song ever? I guess it's simple and is relevant to everyone, but to me there's nothing that stands out about it. So, what would I have picked? Maybe Queen's Bohemian Rhapsody...?