My music roots were planted by my father blasting Led Zep, Pink Floyd, Rolling Stones and Lynyrd Skynyrd in my ear from infancy. That being said, I'd have a list of 'Greatest' songs for different reasons.

Best overall rock song - 'Welcome to the jungle' - GnR
Reason - This song brought hard rock to the mainstream and put it in the faces of those heathen unbeleivers!

Best guitar solo - 'Comfortably Numb' - Pink Floyd.
Reason - David Gilmour! 'Nuff said.

Best drum solo in a rock song - Here I have 2 distinct choices and I'm sure you will all agree. I am going to call this a tie between 'YYZ' - Rush and 'Moby Dick' - Led Zepp

Best bass guitar performance - I know most are thinking Geddy Lee, and so am I. But what song really shows his mastering of the bass? 'La Villa Strangiato' - Rush

Best vocal in a rock song - You may think Robert Plant, or David Coverdale. How about David Lee Roth? Freddy Mercury? David Bowie? Nope. Sebastian Bach wins this one with '18 & Life' - Skid Row

Best vocal harmony - Hands down - 'Bohemian Rhapsody' - Queen