Big B of Bollywood will be singing for an ad commercial in which he also about to appear on screen. Amitabh who is the brand ambassador for Himani Navratna Oil, will be promoting the product via this new ad. Singing is not new for Amitabh, he has already sung in his movies. A few songs to name are ‘Mere angane mein’, ‘Rang barse’ and ‘Chali chali’. It is said that...