"E.T." is a song by American singer Katy Perry from her third studio album, Teenage Dream (2010). She co-wrote the song with its producers Dr. Luke, Max Martin, and Ammo. "E.T." was serviced to radio stations as the album's fourth single on February 11, 2011. One version of the song features verses from American rapper Kanye West, and that version was included on the reissue of the album, Teenage Dream: The Complete Confection. Musically, it is an electronic and hip hop ballad which draws heavily from dubstep and techno, along with smaller amounts of drum and bass. According to Perry, the song lyrically speaks of "falling in love with a foreigner".

"S&M" is a song by the Barbadian singer Rihanna from her fifth studio album, Loud (2010). The song was released on January 23, 2011, as the fourth single from the album. American songwriter Ester Dean wrote "S&M" in collaboration with the producers Stargate and Sandy Vee. Backed by bass beats, a keyboard and guitars, it is an uptempo Hi-NRG and Eurodance track with lyrics about sexual intercourse, sadomasochism, bondage, and fetishes.