by Billboard Staff March 23, 2020, 12:08pm EDT
40. Christina Aguilera, "Come on Over Baby (All I Want Is You)" (No. 1, Hot 100)
In 1999, Christina Aguilera dropped her self-titled debut album, and solidified her place in the teen-pop kingdom. Her third single off the set, “Come On Over Baby (All I Want Is You),” was the upbeat, Radio Disney-approved bop that prompted a generation of girls to sing into their hair brushes during bedroom concerts. The hit song was danceable and addictive, becoming her third straight Hot 100 No. 1 and helping pave the way for the age-old debate: Christina or Britney? -- M.N.
16. Christina Aguilera, "What a Girl Wants" (No. 1, Hot 100)
First recorded by French singer Ophélie Winter, "What a Girl Wants" found Christina Aguilera taking a glitchy, R&B-tinged pop single -- expressing gratitude for a genuinely patient and empathetic boyfriend -- and translating it into her second consecutive Hot 100 chart-topper with the ease of a rising global superstar. Twenty years after its release, "What a Girl Wants" can still take any child of the late 1990s back to summers filled with choppy haircuts and bare midriffs. -- T.M.