Aamir Khan's upcoming film Dangal is the most awaited movie this season. The trailer of the film and also the recently released song have been hogging the limelight for all the right reasons. Lyricist Amitabh Bhattacharya, who took off to the actor's Panchgani bungalow along with composer Pritam, to craft the music of 'Dangal', reveals that Khan constantly kept them on their toes throughout the weeklong process. "Aamir sir was involved, not interfering in the process of music and lyrics writing. The best part is Aamir sir understands the nuances of lyrics," Amitabh said. "As we keep calling him a 'perfectionist', I understood why they say so when I worked with him. He is always interested in interacting with us (lyricist and composer) and to improve the narration from all aspects," he added. "He also carefully listens to each line, understanding the logic behind it. If he doesn't agree with something, you cannot get away with it. He will enquire about the logic behind every phrase," says Amitabh, adding that the actor's inputs helped him hone his craft.