LOS ANGELES: Katy Perry’s songs are her ‘’lockbox’’ of secrets. The singer may not be as obvious when she’s singing about her past relations in her tracks, but she does use her songwriting as a way of healing her broken heart and working through her emotions. Katy - who has recently split with John Mayer - said: ‘’Maybe I’m not specific with names, but that’s my lockbox where all my secrets go. Writing is like therapy. They all [songs] stem from the truth inside of me. I just want them to be relatable, and to be adopted as someone else’s soundtrack.’’–ES