The fourth song and third single "Break the Ice" opens with Spears singing the lines "It's been a while / I know I shouldn't have kept you waiting / But I'm here now". The song features a choir and Keri Hilson singing background vocals sounding almost like a duet. Hilson explained the song is about "two people, a girl and a guy, [...] and the girl is saying, 'You're a little cold. Let me warm things up and .'" After the chorus, the bridge begins with Spears saying "I like this part" mimicking Janet Jackson in "Nasty" (1986). The album's fifth track, "Heaven on Earth", is a Euro disco love song with new wave influences. It is inspired by Donna Summer's "I Feel Love" (1977), with three vocal lines taking place over the beat. Nicole Morier commented that the song was written from a very dark place, saying, "I was thinking of someone and thinking they were so perfect and that I have all these imperfections. [...] I think what's touching about it is that it's from the perspective of someone who feels like they really need this person just to feel safe and feel good." Spears named the song her favorite from "Blackout". The sixth track, "Get Naked (I Got a Plan)" is an uptempo song about sex. It is a duet between Spears and Danja, who sings the chorus with his voice distorted to sound like a decaying moan. Spears contributes a series of gasps, sighs and chants and her voice is also distorted.