Whether a comedy or a drama, the music and voices of Bollywood films have always had their constants: a desire to move the feet and the soul, and a drive to change with the times. These instant classics of the 20th and 21st centuries bolster traditional Sufi devotionals and bhangra dance breaks with Western instrumentals and classical flourishes. Alongside these powerful fusions are songs influenced by international pop and hip-hop, befitting India's ties with both its own medley of cultures and its diaspora.