The title track of the movie Flat 211 are recorded in two different versions; one being the origianl while the other being unplugged one. The original version of the Flat 211's Title Track is recorded by Sa Re Ga Ma Pa famed female playback singer Banjyotsna Borgohain, while the unplugged version of the song is recorded by Tarannum Mallik; whose last released single Blouse Ka Button wasn't a success.
The title track of the movie is called as "Ek Raat Ki Kaali" and it is confirmed to be as the second taste from the movie album. The music for both the version of the song Ek Raat Ki Kaali are composed by Prakash Prabhakar, while the lyrics been written by Tanveer Ghazi. The song was released on 21st April, 2017 on all the digital media & stores via the label of Ajha Global Entertainment.