However, these allegation were denied by the singer, Rabbi Shergill, claiming that the two songs only shared acoustic guitar, bass and tempo, and nonsensical insinuations had come up. Several media reports claimed that the opening notes and guitar strummings of the song were loosely inspired by Eagle-Eye Cherry's song " Save Tonight".
Released as a single track prior to the album launch, it met overwhelming positive reviews on the Internet, especially on YouTube. The lead actor learnt the guitar chords of the song to seem authentic while strumming it. The song portrays the daily routine life of the character Samar who lives in London. Doing it was different for me, to play the guitar in the way its supposed to be strummed." The song also had Katrina Kaif alongside Khan.
At the promotion of the film he said, "I love ‘Challa’ – its a Punjabi, Sufi kind of song. The song was mainly shot in Trafalgar Square and at Canary Wharf and the Hungerford Bridge and Golden Jubilee Bridges, in London. The Punjabi lyrical song "Challa" was filmed on the lead character Samar Anand (played by Shahrukh Khan). Rahman on his first and last collaboration with Yash Chopra. We had great time, it was a great experience. I had not worked with him and now my whole aning career wise is complete. He felt that I should give music in his film. "Yashji saw one of my concerts in London, we invited him.