My dad just asked me this (we are mending fences) and I love questions like this, thought I'd see if anyone else wanted to share their thoughts on it.
The way I see it, there's two approaches:
1. YOUR favorite rock songs
2. What you would put on a Voyager spacecraft to share with another sentient lifeform in the category 'top 5 rock songs'
I'm going to go with #2 because my tastes can get out there, but I'm going to use #1 for tiebreaks.
Aite, time to get to it...