Confident (album) move on and be happy with someone else. The song incorporates pop and soul influences, and is centered on a piano melody, with a stripped down production aimed at highlighting Lovato's vocals. "Stone Cold" received comparisons to Lovato's 2011 song "Skyscraper" and the work of English singer Adele. The album follow with the trap-inspired song "Kingdom Come" it features vocal appearance by rapper Iggy Azalea. Several critics noted that the song is comparable to Azelea's "Black Widow" (2014) featuring Rita Ora. "Waitin for You" featuring vocals by singer Sirah, musically, it's an R&B and hip hop song that starts with
Impossible Is Nothing (Iggy Azalea song) by The Invisible Men and The Arcade, while the "Proust" recreation was produced by Richard Adlam and Hol Ritson. Azalea recorded her vocals at Grove Studios in London, and Conway Studios in Los Angeles where the mixing process was completed by Anthony Kilhoffer—with the assistance of Kyle Ross—at The Mix Spot. The song's title was first revealed by Azalea on 8 August 2013 on Instagram in an image of the album's tentative track listing. On 24 February 2014, Azalea announced the song as a promotional single that would serve as an "instant grat" digital download from the iTunes Store pre-order