 He lent his voice to Yash Chopra's 2012 romantic film "Jab Tak Hai Jaan" singing the leading number "Challa" composed by A. R. Rahman and the lyrics penned by Gulzar.In March 2012, he released his third album "III".Shergill's principal contribution to music lies in the use of Punjabi — which previously had a reputation similar to that of either Bhangra or traditional folk — to create acoustic rock-based ballads, providing a new musical perspective to this language.