Britney Spears, Justin Bieber Score Top Hot 100 Debuts
Singer Britney Spears poses with her Hot Dance Sales Single of the Year award for 'Me Against The Music' backstage at the 2004 Billboard Music Awards at the MGM Grand Garden Arena on December 8, 2004 in Las Vegas, Nevada. Getty

Through the end of the year, Chart Beat is looking back at the biggest achievements on Billboard's charts in 2009 and throughout the past decade.

Tuesday, Dec. 15: Best of 2009, Part 1
Wednesday, Dec. 16: Best of 2009, Part 2

Tuesday, Dec. 22: Best of the 2000s, Part 1
Wednesday, Dec. 23: Best of the 2000s, Part 2

Tuesday, Dec. 29: Best of 2009 By-The-Numbers

Wednesday, Dec. 30: Best of the 2000s By-The-Numbers

RECORD NUMBERS: 2009 produced a bevy of chart milestones. Here is a look at some of the records established, and extended, during the past year.

The figures reflect some of the year's most buzzed-about artists, from veterans such as the Beatles and the late Michael Jackson to newer acts who rose to superstardom, including Lady Gaga and Billboard's Top Artist of 2009, Taylor Swift.

3: The title of Britney Spears' third, coincidentally, Billboard Hot 100 No. 1. "3" became the shortest title to reach the summit, passing the mark of three characters held by seven prior leaders: "Why" (Frankie Avalon, 1959), "ABC" (the Jackson 5, 1970), "War" (Edwin Starr, 1970), "Ben" (Michael Jackson, 1972), "Bad" (Jackson, 1987), "SOS" (Rihanna, 2006) and "Low" (Flo Rida, 2008) ...

4: Total No. 1s - and counting - for Lady Gaga on the Pop Songs airplay chart, the most by any artist to begin a career in the survey's 17-year history. Following "Just Dance," "Poker Face," "LoveGame" and "Paparazzi," 2010 could bring Gaga a record-padding fifth topper: "Bad Romance" rises 4-2 this week with Greatest Gainer honors ...

5: Career leaders on Adult Pop Songs for Nickelback, the most since the list launched in 1996. The song that set the mark, "Gotta Be Somebody," reigned for five weeks beginning in January ...

9: Or, more specifically, 9-9-09, the date that the Beatles re-released their entire catalog of studio albums and their accompanying "Rock Band" video game. On the subsequent Top Pop Catalog albums chart, the Fab Four owned nine of the top 10 and 15 of the top 18 spots. Radio station WCBS-FM/New York celebrated the onslaught with non-stop Beatles programming and a countdown, led by "Hey Jude," of the group's best-loved songs ...

10: Number of consecutive singles that Brad Paisley carried to the top of Country Songs, a three-year-plus streak culminating with the coronation of "Then" in June. Paisley's No. 1 run was the longest since Alabama succeeded 21 times-in-a-row from 1980 to 1987.

11: Weeks totaled atop the Billboard 200 for Taylor Swift's "Fearless." The run stands as the chart's longest reign in the 2000s and the best showing by a country female artist since the chart began incorporating Nielsen SoundScan data in 1991 ...

14: Frames spent at No. 1 on R&B/Hip-Hop Songs for both "Blame It" by Jamie Foxx, featuring T-Pain, and "Pretty Wings" by Maxwell. The songs mark just the fourth and fifth titles to reign for such a length since the chart's 1958 introduction. Mary J. Blige's "Be Without You" is the leader with 15 weeks at No. 1 in 2006 ...

21: Record amount of Michael Jackson titles that flooded the 75-position Digital Songs chart following the King of Pop's passing June 25 (along with four tracks by the Jackson 5). On the first survey after Jackson's death, six of his songs ranked in the top 10, led by "Thriller," "Man in the Mirror" and "Billie Jean" at Nos. 2-4 ...

25: Number of entries the "Glee" cast placed on the Hot 100, the most by any artist since the Beatles roared in with 31 titles in 1964. The act's curtain call of 2009, "Last Christmas," brought the modern holiday classic to the Hot 100 for the first time since Wham! originally released the song in 1984 ...

26: Total, and consecutive, weeks that the Black Eyed Peas commanded the Hot 100 - 12 for the year's top song, "Boom Boom Pow," and 14 for "I Gotta Feeling." The streak passed Usher's 19-week stretch at No. 1 in 2004 with "Yeah!" and "Burn" and made Usher and BEP the only acts in the Hot 100's 51-year archives to monopolize the top spot for at least half a calendar year ...

40: Number of toppers on Dance/Club Play Songs for Madonna, a record extended when the aptly-titled "Celebration" reached No. 1 in September. Could her 41st No. 1 be on the way? Her "Revolver," featuring Lil Wayne, is currently bubbling under the survey ...

44: Like Madonna, George Strait is in the exclusive club of artists to have earned 40 or more No. 1s on a Billboard survey. His "River of Love" upped his count to 44 leaders on Country Songs in April. Conway Twitty is the only other artist with 40 champions on a Billboard chart, having sent 40 songs to No. 1 on Country Songs from 1968 to 1986 ...

50: A landmark number associated with multiple renowned acts this year. The legendary Chubby Checker celebrated 50 years of charting in Billboard with a debut for "The Fly" on Hot Singles Sales in September. Checker first appeared on the Hot 100 dated May 23, 1959, with "The Class." With the debut of "H.A.T.E.U." on R&B/Hip-Hop Songs, Mariah Carey became one of only five women to reach 50 career entries in the chart's history. (And, of course, 50 marked the age of Michael Jackson at the time of his passing ...)

57: Number of top 10s on Country Songs for Reba McEntire, the most among all women since the chart's 1944 inception. When "Cowgirls Don't Cry" reached the top 10 in January, McEntire passed the 55 top 10s amassed by Dolly Parton ...

62: Total appearances Prince has made on R&B/Hip-Hop Songs, as "Better With Time" bowed in September. Since he first arrived with "Soft and Wet" on the July 29, 1978, chart, only Jay-Z (94) and R. Kelly (81) have totaled more entries than his Purpleness ...

76: Record-establishing total weeks spent on the Hot 100 for Jason Mraz's "I'm Yours." The track passed the 69-week stay of LeAnn Rimes' "How Do I Live" in 1997-98 ...

96: Number of spots that Kelly Clarkson's "My Life Would Suck Without You" vaulted (97-1) to the Hot 100 apex on the Feb. 7, chart. The record-breaking ascent bested the 95-position blast (96-1) of Britney Spears' "Womanizer" in October 2008 ...

742: After more than 21 years, Pink Floyd's "Dark Side of the Moon" returned for a record-extending 742nd week on the Billboard 200. The set first appeared on the chart the week of March 17, 1973 ...

2009: Suffix of two former Hot 100 smashes that returned to Billboard charts this year. Michael Damian updated his own 1989 Hot 100 No. 1 with "Rock On (2009)," a No. 28 Adult Contemporary hit in May. In October, actress/singer Naturi Naughton reached No. 15 on Dance/Club Play Songs with "Fame 2009," a cover of Irene Cara's No. 4 Hot 100 hit from 1980 ...

10,000,000: Number of "Fireflies" that "lit up the world" as Owl City's Adam Young attempted to fall asleep. The song became one of just 11 Hot 100 leaders since 2000 - of 129 total - that also charted on Alternative Songs.