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
Work (Iggy Azalea song) from music critics. In a "Billboard" publication, Robert Christgau called the song "excellent" and "something [Azalea] wants us to remember", and commented: "You want authentic? Iggy Azalea has all the lineaments of a risk-taking young rebel without a well-off family to back her up." Christgau went on to praise the track's hooks, and explained: "The hooks, of course, are one reason hard die-hards put her down—in the truimpant Dirty South manner, her hip-hop is radio-friendly as a matter of principle. The cumulative weight of the long-player they never think about." Monica Herrera of "Rolling Stone" called the song "a bombshell-next-door