Book of Qi was originally only known as the "Book of Qi", but after the "Book of Northern Qi" was written, it became known as the "Book of Southern Qi" so that the two could be distinguished. The book contained 60 volumes when written, but one preface was later lost. The format of the text is similar to previous standard histories, with volumes that include annals, treatises, and biographies. Volumes 1 to 8 are annals covering the emperors of the dynasty starting with Emperor Gao in volumes 1 and 2. Some short lived rulers that were not given the posthumous title of emperor
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