This features vocals by rising UK singer Nao, who used to be Kwabs' backing singer. The song was recorded at a precise 82 bpm, 50 percent slower than most drum 'n' bass. Disclosure's Guy Lawrence commented to NME: "Her music is wicked, and she self-produces a lot of it. 'Superego' has a dubstep rhythm so it's a little bit further away from our normal sound. It makes me think of bubbles, so maybe it's bubstep?"
Howard Lawrence told Spin that Nao does not suffer from a superego: "She really knew how much she was supposed to be giving or not giving. She's a producer so she could have easily dived in and been like, 'Use this drum sound.' She actually said at one point, 'You guys are just better at drums, so can you just do it? I'm just going to do the singing.'"
Carla Thomas became the first woman to achieve a Top 10 hit on the Hot 100 with a song she wrote herself when "Gee Whiz (Look At His Eyes)" reached the chart's top tier in 1961. Thomas was just 16-years-old when she penned it.
The lyrics for "Mary, Did You Know?" were written by Christian singer and comedian Mark Lowry, after his pastor asked him to write a Christmas musical for their church. Southern gospel musician Buddy Greene later added music to his words.