stated that the filming for the song "Tumhi Dekho Naa" was done at multiple locations and ended up being extremely time-consuming. The "blue section" of the song was shot at Columbia University in Upper West Side, the "yellow section" was shot at Wall Street in Lower Manhattan, the "orange section" at Bear Mountain State Park, the "pink section" at St. Patrick's Cathedral in Midtown Manhattan, the "red section" at the Pier A Park in Hoboken, New Jersey, and the "green section" at the Union Station in New Haven. The red section was initially designed to take place in the rain. However, due to the low temperatures, the raindrops produced by the rain machines started freezing in mid-air. This posed a risk of physical harm to the actors. Consequently, the filmmakers decided to do away with the rain. However, they still wanted to make use of the 200 red umbrellas they had purchased for the sequence. Eventually, they decided to shoot the red section on a sunny day where the actors used the umbrellas to block out the sun. The shooting for the green section also ran into problems. 200 extras were hired for the section but only 15 showed up. Consequently, crew members present on the set wore the green costumes to take their place. Ayan Mukherji, who was an assistant director of the film, can be seen in a green sweater carrying a box in one of the frames. The film was filmed over a 90-day shooting period in the United States, but a few scenes were shot on four large sets in Mumbai studios. Mukherji suffered from a severe skin allergy during the filming in the US. Like previous Karan Johar films – Kuch Kuch Hota Hai (1998), Kabhi Khushi Kabhie Gham... (2001) and Kal Ho Naa Ho (2003) – Kabhi Alvida Naa Kehna has a four-word title that starts with a "K". Music The music and background score of Kabhi Alvida Naa Kehna was composed by Shankar–Ehsaan–Loy, while the lyrics were penned by Javed Akhtar. This is the second time that lyricist Javed Akhtar and the composers Shankar–Ehsaan–Loy have teamed up for a Dharma production. The trio also replaces Johar's usual collaborators Jatin–Lalit, who had composed for his previous films. The audio rights were acquired by Sony Music India, under Sony BMG, teaming up with Karan Johar, for the fourth time after Kuch Kuch Hota Hai, Kabhi