This Week in Billboard Chart History: 20 Years Ago, Mariah Carey & Boyz II Men Began a Record Reign

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Mariah Carey performs during the 2015 Billboard Music Awards at MGM Grand Garden Arena on May 17, 2015 in Las Vegas, Nevada.

In 1995, 'One Sweet Day' started its 16-week rule on the Hot 100. Plus, remembering chart feats by Rihanna, Elvis Presley & Pearl Jam.

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

Nov. 30, 1991

A landmark date in Billboard Hot 100 history: the chart adopted Nielsen Music data, allowing for a more accurate methodology than ever before. The first No. 1 on the revised ranking? P.M. Dawn's "Set Adrift on Memory Bliss" (which samples Spandau Ballet's 1983 top five ballad "True").

Dec. 1, 2012

A shining star: Three years ago today, Rihanna collected her 12th Billboard Hot 100 No. 1 with "Diamonds."

Dec. 2, 1995

Mariah Carey and Boyz II Men begin the longest reign in the 57-year history of the Billboard Hot 100, as "One Sweet Day" spends its first of 16 weeks (or, 112 sweet days) atop the tally.

Dec. 3, 1977

Just weeks after his death, Elvis Presley collects his record 80th, and last, top 40 Billboard Hot 100 hit, as "My Way" rises 48-38 on its way to a No. 22 peak.

Dec. 4, 1993

Pearl Jam tallied its first Mainstream Rock Songs No. 1, as "Daughter" spent its first of eight weeks at the chart's summit.

Dec. 5, 1998

Another notable date in the Billboard Hot 100's archives: with many radio hits no longer released as commercially-available singles (as labels wanted consumers to purchase full albums), Billboard allows such songs, as well as album tracks, to chart on the Hot 100 for the first time. Among hits that appeared on the list thanks to the change: R. Kelly and Celine Dion's "I'm Your Angel," at No. 1; Shania Twain's "From This Moment On" (No. 5); and Goo Goo Dolls' "Iris" (No. 9).

Dec. 6, 1969

Long before it became a derisive stadium chant aimed at losing visiting teams, Steam's "Na Na Hey Hey Kiss Him Goodbye" crowned the Billboard Hot 100. The song started a two-week rule 46 years ago today.