This ones a bit tough to nail down. Hell every day I listen to something I haven't heard in forever and think that song was the best.
Might be easier if you broke it down a bit. Perhaps, Best song by a particular band.
On that note, I just dusted off some old vinyls I had hanging around in my garage. Haven't had a record player in years, but was just given one that was heading for the dump. I randomly grabbed an album out of my collection, and it was AC/DC's "If You want Blood You've Got it" album. And on that album is a song I had not heard in years that kicks serious azz.
It's called "The Jack" You wont hear that on any radio station.. That would be my vote for the best AC/DC song. Now next time I've had too many and the albums come back out, I'm sure to have a new favorite song as well. :biggrinjester: