Shah Rukh Khan
Shah Rukh KhanVarinder Chawla

Shah Rukh Khan is leaving no stone unturned to promote his upcoming film "Happy New Year".

It has been pretty evident that the star has massive and unique marketing stategies to promote the film.

However, while the entire cast and other key members of the film - including Honey Singh who has rapped a song in the film - will join SRK for a world tour to perform live, surprisingly Vishal-Shekhar who composed the music for "HNY" will not join the team.

"It is strange that Vishal-Shekhar, the film's music composers, are missing from the concert. Instead, Honey Singh will be performing at the shows," Mid-Day quoted a source.

It should be noted that Singh gave Khan "Lungi Dance", one of the biggest hits of 2013, which might be the reason why Khan is fond of the rapper and chose him over his long-time collaborators and friends Vishal-Shekhar for the world tour.

The promotions will include a series of concerts across various cities in the US and Canada in September. SRK and Singh will be accompanied by other stars of the movie, including Abhishek Bachchan, Deepika Padukone, Sonu Sood, Boman Irani, Malaika Arora Khan, director Farah Khan and singer Kanika Kapoor of "Baby Doll" fame.

"The concert organisers are looking at including popular tracks from SRK's earlier films. This is perhaps why Honey Singh has found a place along with the Happy New Year team," the source added.

Another suspected reason is that Singh and Vishal-Shekar do not share a good equation. Vishal, in fact, once had a verbal spat with Singh on Twitter.

The composer duo was apparently disappointed when SRK roped in Singh for the "Lungi Dance" song in "Chennai Express".

In a bit to express their disappointment, the composers even skipped an episode of television show "Indian Idol", where Vishal and Shekher were judges, when Khan came to promote "Chennai Express".

"Happy New Year" is slated to release worldwide on 23 October.