Katy Perry Live: Witness World Wide life, which occurred following her 2012 divorce from Russell Brand, and led her to write the song "By the Grace of God" in 2013. As Perry broke down emotionally, a member of her entourage suggested she end the session, but she declined. She also addressed her sexuality and the reasons why she went public with her feud with Taylor Swift. Perry, who was born Katheryn Hudson, talked about her pop star persona, saying "the fantasy of Katheryn went into Katy and made this bigger-than-life personality," and shared that her new very short haircut was because she "didn't want to look
Walking on Air (Katy Perry song) it would "make you long for C+C Music Factory". The song was also described as evoking the music of Swedish singer Robyn, an artist of whom Perry is a fan. Sal Cinquemani from Slant Magazine was very positive of the song: he described it as "surprisingly soulful, throwback" to 1990s deep house, although he noted that Åhlund decided to give Perry a different sound from the Euro electro-pop he had produced for "Body Talk" (2010). Greg Kot from "Chicago Tribune" deemed the single a "catchy pop tune", while Randall Roberts from the "Los Angeles Times" wrote that the song's "euphoria"