2015 started with Ghoshal's another collaboration with A.R. Rahman in Tamil film "I". Besides rendering vocals for original Tamil duet "Pookkalae Sattru Oyivedungal" alongside Haricharan, she also dubbed its Hindi version "Tu Chale" alongside Arijit Singh and Telugu version "Poolane Kunukeyamantaa" alongside Haricharan. The original Tamil version song "Pookkalae Sattru Oyivedungal" was met with positive reviews by critics, with most critics praising the vocals of Ghoshal. Nicy V.P. from International Business Times commented on Tamil version, "Haricharan's crystal clear voice, Shreya's Hindustani driven singing lead to a chart-buster, here. With regards to Shreya Ghoshal, we have to dig deep the dictionary to come up with some new adjectives to praise her singing." Later that year, Ghoshal sang the female version of song "Hasi" from film Hamari Adhuri Kahani composed by Ami Mishra which got critical precedence over male version sung by Ami Mishra himself. Devesh Sharma from Filmfare remarked, "The female version of Hasi, sung by Shreya Ghoshal, works better than the male version, sung by guest composer Ami Mishra himself. Ghoshal elevates it with her superb effort and the softer arrangement works better for it overall." Ghoshal also performed the female version of the song "Gaaye Jaa" for the film Brothers composed by Ajay-Atul which received positive reviews from music critics. The Times of India stated, "Shreya Ghoshal scores brownie points for her rendition". Glamsham praised Ghoshal's vocals labelling them "sugary sweet and superbly controlled". Bollywood Life commented, "Shreya Ghoshal amazes the listener by making this situational song such a great listen and just for her lovely voice, one has to put this song on a loop" The same year saw Ghoshal again collaborating with Sanjay Leela Bhansali in Bajirao Mastani.