Ah. It was quite clear that many of her lyrics were based on Fitzgerald's novel.
Especially 'National Anthem' - "money is the anthem of success, so put on mascara and your party dress" -
She's basically talking about the "upper echelon" that Daisy Buchanan lived. Interesting!
Aehm, Y'all so excited if I hear right and this is The Great Gatsby they talking about then the songs will be sung by the leading Lady thus Carey Mulligan.