This Week in Billboard Chart History: In 2006, 'SOS' Became Rihanna's First Hot 100 No. 1

Scott Gries/Getty Images for Universal Music
Rihanna poses for a photo before a party to celebrate the release of her new album "A Girl Like Me" on April 22, 2006 in her hometown of St. Michael, Barbados.

Plus, remembering feats by Gloria Estefan, Janet Jackson & Madonna.

Your weekly recap celebrating significant milestones from more than seven decades of Billboard chart history.

May 13, 2006
Rihanna reached the top of the Billboard Hot 100 for the first time, with "SOS." She's added 13 more No. 1s since, tallying the second-most leaders (14 total) among women in the chart's history. Among all acts, only the Beatles (20) and Mariah Carey (18) have more.

May 14, 1988
Gloria Estefan made her first trip to No. 1 on the Billboard Hot 100, as love song "Anything for You" (with Miami Sound Machine) reigned. She'd lead again with "Don't Wanna Lose You" in 1989 and "Coming Out of the Dark" in 1991.

May 15, 1993
After scoring seven Billboard Hot 100 top 10s from her 1989 album Rhythm Nation 1814, Janet Jackson picked up right where she left off, as "That's the Way Love Goes," the first single from janet., began an eight-week run at No. 1. janet. would generate six Hot 100 top 10s, and "Goes" became her sixth of 10 No. 1s.

May 16, 1998
Natalie Imbruglia's "Torn" spent its first of 11 weeks at No. 1 on the Radio Songs chart.

May 17, 2008
Madonna earned her seventh of eight No. 1s on the Billboard 200 with the chart-topping launch of Hard Candy. The set yielded the No. 3 Billboard Hot 100 hit "4 Minutes," featuring Justin Timberlake and Timbaland.

May 18, 1991
Powered by the highest-charting Billboard Hot 100 hit of the group's career, "Losing My Religion," which rose to No. 4, R.E.M. landed its first of two No. 1 albums on the Billboard 200, Out of Time. Monster topped the Billboard 200 in 1994.

May 19, 1990
More Madonna: She'd been inspired by dancer/choreographers Jose and Luis Xtravaganza from the Harlem "House Ball" community, who introduced vogue-ing to her at the New York club Sound Factory. On this date, her song "Vogue," with its iconic back-and-white video, struck a pose atop the Billboard Hot 100 for the first of three weeks.