Sun Tzu Skeptics cite possible historical inaccuracies and anachronisms in the text, and that the book was actually a compilation from different authors and military strategists. Attribution of the authorship of "The Art of War" varies among scholars and has included people and movements including Sun; Chu scholar Wu Zixu; an anonymous author; a school of theorists in Qi or Wu; Sun Bin; and others. Sun Bin appears to have been an actual person who was a genuine authority on military matters, and may have been the inspiration for the creation of the historical figure "Sun Tzu" through a form of euhemerism.
The Book of Taliesyn band's singer Rod Evans are very functional to the music and the marketing Deep Purple's record label was building up for the American hippie audience. Evans took inspiration for the fantasy-themed "Listen, Learn, Read On", which contains lyrical reference to the album's title, from the 14th-century Welsh manuscript Book of Taliesin, a collection of poems attributed to the 6th-century poet Taliesin. The title and cover art of the album were also inspired by the manuscript. Instead psychedelia and its rituals play a large part in the lyrics of "Shield". Simper thinks that Evans' lyrics are "far better than anything (...)