Bollywood films prominently feature song and dance as an important element of Indian culture and tradition. Music and musical sequences are essential to the success and marketing of popular films. Filmmakers work to integrate singing and dancing organically into the story. Over time, the style of songs in Hindi films has evolved from classical and traditional to incorporating more contemporary dance music, pop influences, and mixing Hindi and English lyrics. While Bollywood films now feature many foreign backup dancers, especially from Eastern Europe, in musical sequences, the main Indian heroes and heroines are still expected to embody traditional Indian values and modesty in their portrayals.