Not all songs in the main setlist are available from the start. Once a song is unlocked for play within Career Mode, it becomes available for play in all other modes. When working through Career Mode at a specific difficulty level, the next tier of songs is unlocked once the required number of songs on the current tier (3-5, depending on difficulty and console) are completed. Additionally, the encore song for a particular tier is only made available once its requirements are completed. On the Easy difficulty setting, there are no encores available, but the next tier will be unlocked immediately after completing the required songs in the previous tier.