Roots of Paula DeAnda

Christina María Aguilera is an American singer, songwriter, actress, and television personality. An influential figure in music, Aguilera is noted for her four-octave vocal range, melismatic singing style, use of the whistle register, and continual reinvention of her image and sound. Referred to as the "Voice of a Generation", she was ranked among the greatest singers of all time by Rolling Stone. Her works have incorporated socially conscious and sexual themes, generating both controversy and critical acclaim.

Brandy Rayana Norwood, known professionally as Brandy, is an American singer, songwriter, and actress. She is known for her intricate vocal riffs, and is regarded as an influential figure in contemporary R&B.

"Upgrade U" is a song by American singer Beyoncé from her second studio album, B'Day (2006). It features additional vocals from rapper Jay-Z. It was composed by Swizz Beatz, Cameron Wallace, Beyoncé, MK, Makeba, Sean Garrett, Angela Beyincé, Jay-Z, Willie Clarke, Clarence Reid, and Beyoncé's sister, Solange. Columbia Records released "Upgrade U" as a promotional single on October 8, 2006, in the United States only. "Upgrade U" draws from the genres of hip hop and R&B. The concept of the song is that of a woman describing herself as the key to upgrading a man's lifestyle.