I didn't read through all the posts, and I'm not certain what "Rock" means, but at the moment I have a special love of "A Whiter Shade Of Pale" (as much Classical as Rock, what with it's J.S. Bach compositional elements) and "The Weight", two majestic, soaring masterpieces of song. That they are Rock (if they are) is incidental; a great song is a great song, regardless of genre-style performance. Now, if you asked for a Rock 'n' Roll song, THAT would get a different answer: "I Hear You Knocking", the version by Dave Edmunds.