translation.en:  Pharrel wrote the main theme song and performs it: the lyrics are peppy and comical.  There are other contemporary and classical pieces that help weave the narrative together.
translation.hi_en: Pharrel ne main theme song likha aur performs kiya: lyrics peppy aur comical hainaur bhi contemporary aur classical pices hain jo narrative ko sath mein weave karne mein help karte hain