Switch on to any FM station or music channels on television, the soulful title track from director Karan Johar's recently released "Kabhi Alvida Naa Kehna", which is crooned by Sonu Nigam, is playing frequently.

Johar, who cannot think of any other name except Shah Rukh Khan for lead roles in his films, invariably wants Sonu to sing title-tracks.

From "Kabhi Khushi Khabie Gham" to "Kal Ho Naa Ho" to "Kabhi Alvida..." all the title tracks were recorded in Sonu's voice and all of them were chartbuster.

"I always choose Sonu for all my projects because he has the best voice in the industry today," said Johar.

Critics feel Sonu possesses special skill to get into listeners' soul with his voice and Shankar, Ehsaan and Loy, music directors of "Kabhi Alvida...," echo this sentiment.

"For us I think Sonu is the best singer in the industry and the way he has delivered the title song and 'Tumhi dekho naa', it shows his sincerity. He is a wonderful singer and none of our project is complete without him."

In an era where public memory is short-lived, Sonu has probably achieved immortality in the hearts and minds of music lovers worldwide.