GameFAQs - FAQs, cheats, saved games, reviews, images, and a message board. - http://www.gamefaqs.com/console/ps2/data/939144.html
GameSpot - Reviews, news, previews, images, videos, cheats, and a forum. - http://www.gamespot.com/ps2/puzzle/guitarhero80s/
Wikipedia - Article describing history, gameplay and design, soundtrack, and reception. - http://en.wikipedia.org/wiki/Guitar_Hero_Encore:_Rocks_the_80s
GameStats - Videos, screenshots, average scores, article links, and a message board. - http://www.gamestats.com/objects/878/878270/
IGN - Videos, screenshots, FAQs, reviews, preview, news, press releases, and a message board. - http://ps2.ign.com/objects/878/878270.html
GameSpy - Review, preview, news, screenshots, and videos. - http://ps2.gamespy.com/playstation-2/guitar-hero-ii-rocks-the-80s/