Simplify the following text for a Grade 4 native English-speaking person.
Original: With two tracks already confirmed by Gaga â `` one she has been performing during The Monster Ball Tour , she has referred to the album as `` the greatest '' of the decade about `` what keeps us up at night and what makes us afraid . ''
Simplified: Gaga has said the album is about `` what keeps us up at night and what makes us afraid . ''