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
Iggy Azalea Nicki Minaj's "" (2012). Azalea also logs the highest bow for a female rapper's debut album since "Pink Friday" (2010), which had entered at number-two with 375,000 copies sold. Azalea was then featured on American singer Ariana Grande's single "Problem", which was released on 28 April 2014. The song was released as the lead single from Grande's second studio album. Shortly after, Azalea also appeared on Jennifer Lopez's single "Booty". On 28 May 2014, "The New Classic"s fourth single "Fancy", reached number-one on the US "Billboard" Hot 100 chart, with Azalea being the fourth solo female rapper ever to top