Four albums in, Andy Grammer maintains his position as one of pop’s fiercest optimists. Best known for hit singles “Keep Your Head Up” and “Honey, I’m Good,” the Los Angeles singer-songwriter keeps the good vibes flowing here on Naive, an album of songs that defend his unshakable positivity. “If it’s stupid to see the good in everything/I guess I’ll plead/I’ll plead good deed/To being naive,” he sings on the title track. Elsewhere, he links up with South African choral group Ladysmith Black Mambazo (most famous for their collaborations with Paul Simon in the mid-1980s) on “She’d Say,” an uplifting lullaby for his baby daughter written from the perspective of his late mother.