This particular album lets us see some maturity in the pop star's music. The songs have various genres and target audiences. The album has had six Top 40 hits: Roar (1), Walking on Air (37), Unconditionally (14), Dark Horse (1), Birthday (17), This Is How We Do (36). It's clear that the album couldn't outsell 2010's record-breaking Teenage Dream, although I think this one has more remarkable songs. Possible future single releases include Legendary Lovers & Walking On Air.