three other songs, all of which belonged to Kesha. Coyne was later asked if he still intended to contribute to her album he responded, stating: "I'm trying to. I think we're getting together right before Easter. We've already done three songs-- they're hers". According to Twitter messages by Coyne, recording between the duo continued in April 2012 and a track that discussed "futuristic sex toys" was created. Coyne and Kesha revealed via Twitter that a song titled "You Control My Heart" was created. Coyne announced that he was in the process of mixing the song. "Past Lives", a track described by Coyne as a "stellar track" was confirmed to be another collaboration between the pair. Altogether, Coyne and Kesha's collaboration yielded between six and seven tracks. In mid April 2012, Billboard published an article claiming that Scottish producer Calvin Harris had contributed several tracks to the upcoming album. Their specific recording date was unknown. In May 2012, Kesha continued to record with Dr. Luke and artist Sia, although this track did not make the final track listing. Rock singer Iggy Pop was also revealed as a collaborator, when the singer tweeted a picture in May 2012 saying that the singer would feature on the record. Billboard later confirmed Iggy Pop would feature on "Dirty Love", produced by Dr. Luke. Kesha continued to work with Dr Luke and Benny Blanco, and with new collaborators Henry Walter and Fun. lead singer Nate Ruess – the four created a track described by Blanco as "old hippie rock". That track was later revealed as "Die Young". Kesha revealed that she and Dr Luke had created 17 incomplete songs, including "Last Goodbye", "Die Young" and "Supernatural". She commented on the sound, "I want it to be a mix of what works on the radio and what I listen to in my spare time", she says. "I'm on a steady diet of T. Rex and Iggy Pop." Composition In contrast to her debut album Animal (2010), Kesha stated her second album would also incorporate rock genres, inspired from the music of the 1970s. 1970s rock singers Led Zeppelin, AC/DC and Iggy Pop's album, The Idiot, were cited as musical inspirations for the next record. Kesha stated in press that she intended to incorporate a confluence of genres, including blues music, saying, "I definitely want the next record to be experimental and I would love to play