"Mantaray" includes a variety of musical styles, including pop, glam and cabaret. She said: "it has probably got the Siouxsie from seven years old to now, a life painting of where I started and where I am up to now". "If it Doesn't Kill You" was one of the oldest lyrics she wrote, and the original music was different before she first met Jones. He was drawn to the title and in Siouxsie's words, "he made it one of those classic songs that could be associated with James Bond. It's quite cinematic." "Sea of Tranquility" existed as a lyric on its own and was her idea of writing a sci-fi murder mystery. Jones and Evans "took it somewhere with that whole bossa nova thing" and the title of the album comes from a line of it. A manta ray is described as "a ghost of a roar from the sea floor" in the song. In an interview for "The Telegraph", she further explained: "Because the sounds on the album are so diverse, we needed an abstract title. Rays symbolise something from deep space and a long, long time ago." "The deep ocean also inspired TV series "Stingray" and science fiction. Which takes us on to space - those wings. Deep ocean and space are almost reversible worlds."