Need Help: Rock Music for a Walking Mix
 

I just picked up my wife a little 512 MB mp3 player for walking around the neighborhood and while on her treadmill. I'm guessing ti will hold about 120 mp3s or so.

She likes classic rock bands like AC/DC, Bad Company and Steely Dan. While I know a bit by the second two artists, I claim almost complete ignorance of the AC/DC catalogue. And anyway...I'm not too sure what makes a good walking song.

Can anyone please recommend some songs by those artists, or artists like them, to put on her mix?

Would be greatly appreciated.