QI the working title "Quote Interesting". This book was eventually published in 2008 as "Advanced Banter". Similarly, on the Banter feature of the Series B DVD, Lloyd also previewed the title of "QI"s fourth book, "The QI Book of the Dead", which went on sale on 15 October 2009. 7 October 2010 saw the publication of "QI"s fifth book—"The Second Book of General Ignorance". Written by the same authors, this book covers a whole new series of questions on a wide variety of topics, which promises to prove that "everything you think you know is (still) wrong". The sixth "QI" book,
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