The film's music album, charged at $8.91, followed Californian reggae band's "Rebelution" that is ranked 12.
"The music of 'Rock On' is catching on very well. This is the first time an Indian album has reached so high on iTunes," Kulmeet Makkar, CEO, Big Music and Home Entertainment, told IANS.
The Anil Dhirubhai Ambani Group (ADAG)-promoted Big Music is behind the launch of the film's music.
The film, released Aug 29, has been widely lauded for its robust rock soundtrack created by composer trio Shankar-Ehsaan-Loy. It's songs "Pichhle saat dino mein", "Rock on", "Socha hai" and "Sindbad the sailor" are being hummed by youngsters galore.
The fact that it is now among the top 15 albums on iTunes indicates the popularity of the film's music beyond Indian shores.
"The music of 'Rock On' is not typically Indian. It is rock, which is a world genre and it also has a big youth connect," Makkar said.
"iTunes is the number one site for music download abroad and we are very proud that 'Rock On' has made it till there. The fact that the music has been accepted abroad and is doing well is a major boost for us," he added.
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"According to our distribution structure, we distributed the music to 370 online stores across 45 countries. But we still don't consider it a profitable revenue stream. The main revenue streams for the music are ringtones and audio CDs," he added.
Makkar explained that since people in India prefer to download music illegally from Internet sites free rather than paying for it, it is difficult for them to penetrate the Indian online music market.
The sales of the audio CDs have however "become very encouraging", he said.
The music album of "Rock On" has nine soundtracks out of which six have been crooned by filmmaker Farhan Akhtar, who has made his acting debut with the film as well. Apart from Farhan, the film has introduced director Abhishek Kapoor and actresses Prachi Desai and Shahana Goswami.
Makkar said that the film's DVD will be released by the end of October but for those who want to enjoy the rock concerts in the film, a DVD of the songs will be released very soon.
Big 92.7 FM, also a part of Reliance ADAG-promoted Reliance Entertainment, has been arranging major on-ground activities to promote the film. One of the highlights is the "Rock On" concert that has already been held in Mumbai, Pune and New Delhi and left the audience wanting more.
Set in Mumbai, "Rock On" has an urban feel and revolves around a group of four aspiring musicians who form a hippie rock band called 'Magic'.
It is led by singer Aditya (Farhan) and also has temperamental guitarist Joe Mascarenhas (Rampal), talented keyboard player Rob (Kenny) and drummer Kedar Zaveri (Kohli).ALSO READ: Bollywood's iconic & unforgettable trios: From 'Hera Pheri' to '3 Idiots' to 'Stree' & others