Get both albums to "Platinum" rank in each stage of your career by completing all four songs and two challenges. Get a "Platinum" rank on all discs to unlock all characters.

Andre: Get a "Platinum" rank on the third set of albums.
Courtney: Get a "Platinum" rank on the second set of albums.
Jimmy: Get a "Platinum" rank on fifth set of albums.
Madison: Get a "Platinum" rank on fourth set of albums.
Zach: Get a "Platinum" rank on first set of albums.