So I was so close in unlocking the song unlockables but when I Played today, it said that my save file was corrupted (idk how that happened since i make sure that it returns to the dashboard before I open the tray and stuff)so i had to start all over again. I just want to know how is the unlocking determined? is it like every 5 songs played? I really wanted to unlock the songs before my semestral break ended.