Guitar Hero fans can now cast their votes online to determine the order in which songs will be revealed for Activision's Guitar Hero Greatest Hits.

Guitar Hero Greatest Hits is set to take the most popular music from Guitar Hero, Guitar Hero II, Guitar Hero Encore: Rocks the 80's and Guitar Hero III: Legends of Rock (which were previously available for guitar-only play) and deliver them as a full band experience.

Starting today, you can cast your votes for which previous Guitar Hero game you would like the set list unveiled from first. Each week, a portion of the Guitar Hero Greatest Hits set list will be revealed based on which prior game captures the most votes.

Guitar Hero Greatest Hits will feature a total of 48 master recordings. For more information, and to cast your votes, head over to the official site