Ah Guitar Hero, many a fine hour spent with roomates playing that :)
We have 1 and 2, my friend has beaten everything on Expert except Free Bird, Institutionalized, and Hangar 18 I believe. I'm not quite as good as he is, but I can handle most everything on Expert.
My favorites are Stellar, Killer Queen, and Ziggy Stardust on 1, and Sweet Child O' Mine, Monkey Wrench, and Elephant Bones on 2. And Trogdor :P
My best song is Stellar on 1, my highest score is 179,776 (just checked it haha)
I really wish we had the xbox version so i could download extra songs from live. what i wouldnt give for The Blue Album by weezer :P