Their first collaboration, Kal Ho Naa Ho finds Shankar, Ehsaan and Loy poised for greatness with their meld of fresh, innovative sounds. The title track—featuring soulful vocals by Sonu Nigam—became one of the biggest Bollywood songs of all time, and plaintive theme "Heartbeat" is still widely used today. Vasundhara Das, Shaan, KK and Loy come together on the upbeat “It’s the Time to Disco” for a song that gently pokes fun at the plight of the film’s love-sick trio. Meanwhile, a cover of Roy Orbison’s 1964 classic “Pretty Woman” is transformed with Punjabi dhol beats and Mahadevan on vocals.