On his Hindi soundtrack to OK Jaanu, A. R. Rahman swirls together musical elements both classical and current for this version of the Tamil soundtrack to OK Kanmani. The airy “Jee Lein” is infused with carefree abandon, while “Saajan Aayo Re” leans towards emotive, classical ragas and traditional vocals. The nostalgia-inducing remix of Rahman’s 1998 original “Humma Humma” may have grabbed the most attention—but you might find yourself coming back again and again to "Kaara Fankaara", with its deliciously obsessed lyrics and a star-studded rap chorus.