Is there a way to put Guitar Hero I & II songs on any of the PS3 GH games?

I have a PS3 and have GH3: Legends of Rock, Guitar Hero 5, Band Hero, and Guitar Hero: World Tour. I started Guitar Hero back when it was on the PS2 and I miss playing the songs that were on those games. Is there a way I can play those songs again? Or can I download the games from the Playstation Network? Thanks everyone.