Sept. 15, 1990
Twenty-five years ago: following their debut Billboard Hot 100 No. 1 "Hold On," Wilson Phillips returned to the top with "Release Me." In 2012, the trio reunited for a reality show (Still Holding On) and the covers album Dedicated, which became its highest-charting title on the Billboard 200 since 1992.
Sept. 16, 2000
Madonna scores her first Billboard Hot 100 since 1995 (and her 12th and most recent leader), as "Music" shimmies to the summit.
Sept. 17, 2011
Adele's "Someone Like You" becomes the first piano-and-vocals-only No. 1 in the Billboard Hot 100's history.
Rewinding the Charts: Five Years Ago, Katy Perry 'Dream'-ed History Into Reality
Sept. 18, 2010
Katy Perry takes the title cut of her album Teenage Dream to the top of the Billboard Hot 100. It's one of five No. 1s from the set, the only one by a woman ever to yield a quintet of leaders.
Sept. 19, 1987
… As noted in the flashback above, Katy Perry's Teenage Dream is the only album by a woman to produce five Billboard Hot 100 No. 1s. The only other such set by any artist? Michael Jackson's Bad. Twenty-eight years ago today, Bad generated its first topper, "I Just Can't Stop Loving You," with Siedah Garrett.
Sept. 20, 1969
On this date 46 years ago, a cartoon tune topped the Billboard Hot 100: the Archies' "Sugar, Sugar." Of course, there was real talent behind the scenes: Andy Kim co-wrote the song. He'd go on to top the Hot 100 in 1974 with "Rock Me Gently."