Once has been played on NTS over 10 times, featured on 13 episodes and was first played on 1 December 2015.

Once refers to several different artists. 1) A major motion picture with music performed and written by Glen Hansard and Marketa Irglova. 2) A hard rock band from Oskarshamn, Sweden. 3) Once Mekel, a male singer from Indonesia, Ex-Vocalist of Indonesian Band Dewa 19. 4) A symphonic metal band from Germany. 5) Yuji Sugimoto's (ex WEAVER) solo project