The film's rags-to-riches fairy tale plot might seem improbable, but Rahman identifies with the film's hero - an orphan from Mumbai's slums who overcomes hardships to get a shot at winning a fortune on India's version of "Who Wants to Be a Millionaire?" as he searches for his lost love.
"I can relate to the film because I take life positively and feel that even after great depression something good will come out," said the soft-spoken 43-year-old composer, in a telephone interview from Los Angeles.
When Rahman performs his two Oscar-nominated songs, "O ... Saya" and "Jai Ho" before a global audience at Sunday's Academy Awards ceremony, he will be realizing his own dream. A deeply spiritual man, Rahman believes that music and film have the power to "bring people together" across boundaries of caste, religion, nationality and race.
Rahman, who has already won Golden Globe and British BAFTA awards for his score, says an Oscar would be a "big dream" to be shared with his millions of fans in India and elsewhere. They have made him one of the world's best-selling recording artists on a par globally with Madonna and the Rolling Stones.
With nominations for best song and original score, Rahman could equal in one night the total number of golden statuettes taken home by Indians in the Oscars' 80-year-history. Costume designer Bhanu Athaiya won for "Gandhi" in 1982 and arthouse director Satyajit Ray received a lifetime achievement award in 1992.
Rahman hopes an Oscar win will make Western audiences more aware of contemporary Indian film music.
"We have a different philosophy of approaching film music and I would say there's lots to give which I always wanted to happen," said Rahman. "We've been great fans of films of the West and we respect them so much and we also have certain qualities."
Rahman had to overcome many hurdles on his path from his native Chennai (formerly Madras) in south India to the Kodak Theater for the Academy Awards ceremony.
After his musician father died when he was 9, his mother scraped out a living by renting out her husband's musical equipment. Rahman began supporting his family at age 11 as a keyboard player in south Indian film composer Ilaiyaraaja's ensemble, and later formed a rock band and toured with prominent Indian musicians like tabla maestro Zakir Hussain. He earned a scholarship to the Trinity College of Music in London, where he studied Western classical music.
Back in India, he worked on advertising jingles until director Mani Ratnam tapped him to compose the score for the 1992 film "Roja." Rahman ended up changing the face of Indian film music by introducing Western styles like reggae, rarely heard on Indian soundtracks.
"I think my philosophy of life is music is universal ... so I'm never closed to things," said Rahman. "Like some people say, 'Oh, I hate heavy metal,' or 'I hate jazz.' Why do you need to hate it? Why don't you appreciate it in a certain context."
Western film composers began taking note of his work. Rahman's first major exposure to a larger Western audience came when Andrew Lloyd Webber asked him to write the songs for the 2002 London musical "Bombay Dreams."
"Like any good artist, A.R. is not a traditionalist, he's a revolutionary. He uses all the revolutionary things that come from all over the world in his stuff ... hip-hop beats, electronics .. and there's an incredible inquisitiveness and playfulness in his music," said the Oscar-winning, German-born film composer Hans Zimmer. "Plus he writes a bloody good tune ,,, and at the end of the day it comes down to can the guy write a tune or not and obviously he can."
Rahman's "Slumdog" success has led to offers from U.S. producers, but he has no intention of abandoning Bollywood for the lures of Hollywood.
"Both of them complement each other beautifully because I'm learning stuff from here and then giving it there and taking stuff from there and giving it here," Rahman said. "India is going through this huge change in the whole vision of film making and I want to be a part of that change."
By Charles J. Gans