Bombay duck is said to have associated the pungent smell with that of the newspapers and mail which would come into the cantonments from Bombay. The term was later popularized among the British public by its appearance in Indian restaurants in the UK. In his 1829 book of poems and "Indian reminiscences", Sir Toby Rendrag (pseudonym) notes the "use of a fish nick-named 'Bombay Duck'" and the phrase is used in texts as early as 1815. The Bombay duck lives in the tropical areas of the Indo-Pacific. The fish is also known as "strange fish" because of its discontinuous distribution along the
What Love Is Made Of three minutes and fifty-five seconds (3:55), "What Love Is Made Of" is an uptempo dance and house track that has been described as "rave-y" and "trance-y". Its instrumentation contains the sounds of pianos and synthesizers. Jordan Sargent of "Spin" observed that it continued the musical style first introduced in Katy's 2012 extended play (EP), "Danger EP", which was "straight-forward house". Idolator's Sam Lansky compared her performance in the song to recording artist Siobhán Donaghy. Critical response to "What Love Is Made Of" was generally positive: most critics noted Katy's vocal performance and commended its sound. Siân Rowe from "NME" was