Lady GaGa to The Black Eyed Peas: No. 1 Songs From 2009

The Black Eyed Peas
Kevin Winter/DCNYRE2010/Getty Images for DCP

(L-R) Taboo,, and Fergie of the Black Eyed Peas perform onstage during Dick Clark's New Year's Rockin' Eve With Ryan Seacrest 2010 at Aria Resort & Casino at the City Center on Dec. 31, 2009 in Las Vegas. 

We'll breakdown 2009, but you can relive all the Hot 100's number one hits year by year:

The year is 2009. The first African American president has just been inaugurated. The American and world economy is on the recovery track after the worst recession in seven decades. Michael Jackson, the King of Pop, dies of a medical overdose in his Los Angeles home, sending the world into a frenzy over the end of an era. 

Meanwhile in current music, Beyoncé releases one of her best-known songs, "Single Ladies (Put A Ring on It!)" and Lady GaGa makes her debut, instantly gaining her worldwide fame and recognition. The Black Eyed Peas monopolize the number one position with two different tracks. 

Revisit all of 2009's biggest hits with a full list of the Hot 100 chart-toppers here: 

1. Beyoncé, "Single Ladies (Put A Ring On It!)"

Beyoncé leads the chart-toppers with one of her most famous and successful songs, "Single Ladies (Put A Ring On It!)".  

2. Lady Gaga Featuring Colby O'Donis, "Just Dance" 

Lady Gaga's debut in the music world is an instant success: "Just Dance" is a happy and fun track prompting fans to start dancing their troubles away. 

3. Kelly Clarkson, "My Life Would Suck Without You"

The song's rock and dance elements help it fly to the top of the charts (from No. 97) setting a record for the biggest jump on the Billboard Hot 100.

4. Eminem, Dr. Dre & 50 Cent, "Crack A Bottle" 

The return of Eminem after his successful Encore in 2004 is welcomed by the critics and the public alike. He proves yet again his status as one of the best rappers in the industry. 

5. Flo Rida, "Right Round" 

"Right Round" is one of Flo Rida's three chart-toppers. The success of the record is unmatched until the release of "Whistle" in 2012.  

6. Lady Gaga, "Poker Face" 

Lady Gaga's second hit of the year, "Poker Face" will go diamond in 2015, making her the first female digital diamonds award recipient (in other words, the record goes platinum 10 times). 

7. The Black Eyed Peas, "Boom Boom Pow" 

The band's first number one song explodes overnight with its dance beat and 808-old-school sound. The crossover of R&B and hip-hop contributes to the wild success of the track.  

8. The Black Eyed Peas, "I Gotta Feeling" 

2009 is the year of The Black Eyed Peas, with their album The E.N.D., which has sold over 11 million copies worldwide. "I Gotta Feeling" is its second single, which dethrones their first release and helps the band keep up their reign atop the charts. The two songs occupy the two top positions simultaneously.

9. Jay Sean Featuring Lil Wayne, "Down" 

Jay Sean's first single released while signed under his new American label, Cash Money, is the lead track of his album All or Nothing

10. Britney Spears, "3" 

The song debuts on Britney's greatest-hits set The Singles Collection and gains extreme popularity after a wardrobe malfunction during a Vegas performance. 

11. Owl City, "Fireflies" 

An electro-pop single. influenced by The Postal Service and Death Cab For Cutie, is a mix of classic and fresh pop sound. Adam Young reinterprets the contemporary trends in music and creates a unique song that stands out among the upbeat hip-hop and pop chart-toppers. "Fireflies" takes the top spot twice.

12. Jason DeRulo, "Whatcha Say" 

Aspiring to be better than Michael Jackson, Jason DeRulo has yet to release another hit matching the success of "Whatcha Say." 

13. Jay-Z + Alicia Keys, "Empire State Of Mind" 

Jay-Z's New York anthem resides in the top of spot at the end of the year. That's New York, the concrete jungle where dreams are made of.