From Justin Timberlake to Barack Obama -- Jimmy Fallon's Best 'Late Night' Musical Performances!

As the host celebrates his 39th birthday, sing along with his most memorable musical numbers

There are many reasons why watching Late Night with Jimmy Fallon is an essential part to everyone's night. Not only is Jimmy Fallon hysterical, but he is also a great singer and performer!

From Justin Timberlake to President Barack Obama -- that's right, the president! -- Jimmy has only the best guests appearing on his talk show sing along with him.

Don't believe us? Watch Jimmy's best Late Night performances below. (Warning: you may want to break out in song and dance while watching.)

Jimmy Fallon & Justin Timberlake, "Only Wanna Be With You"

Courtesy of YouTube

With summer coming to an end, Jimmy got nostalgic as he recalled his favorite childhood memory of the season: sleepaway camp with his "best friend forever" Justin Timberlake. If you were a camp kid in the '90s who loved Boy Meets World, Hootie and the Blowfish, and Dunkaroos, then you will appreciate this L-O-L sketch.

The Chickeneers, "Ho Hey"

Courtesy of YouTube

Nope, they are not doing the chicken dance! Jimmy teamed up with country singer Blake Shelton and Park and Recreation's Nick Offerman to bring audiences "Ho Hey," the chicken version. Watch as the feather-covered men cluck their way through the hit song.

Jimmy Fallon, Mariah Carey & The Roots, "All I Want for Christmas is You"

Courtesy of YouTube

Although everyone's favorite Christmas song never gets old, Jimmy added a twist to Mariah Carey's "All I Want for Christmas is You" by singing the song with classroom instruments. Dust off your elementary school wood block and recorder, and sing along.

The Ragtime Gals, "Sexy Back"

Courtesy of YouTube

If you ever thought a barbershop quartet couldn't bring sexy back -- think again! Justin Timberlake put on his suit and bow tie to sing along with The Ragtime Gals.

Jimmy Fallon & President Barack Obama, "Slow Jam The News"

Courtesy of YouTube

It is hard to book the President of the United States for a talk show since he is, you know, busy taking care of America and all. But Jimmy made the impossible possible by having Barack Obama slow jam to the news. Who knew the president had such a soothing singing voice? Maybe he should look into a singing career when his term is up!

Shazzazz, "Do It," "We're Gonna Do It," "Remember When We Did It"

Courtesy of Hulu

We all know Gwyneth Paltrow is a double threat when it comes to acting and singing country music, but did you know that the blonde beauty can rap? Her and Jimmy channeled their inner Marky Mark in the '80s rap videos "Do It," "We're Gonna Do It" and "Remember When We Did It."

Jimmy Fallon & Justin Timberlake, "The History of Rap"

Courtesy of YouTube

Whenever Justin Timberlake makes an appearance on Saturday Night Live, he is always king of the show. So it is no surprise that JT does the same when he visits Late Night with Jimmy Fallon. The "Take Back the Night" singer and Jimmy showed off their rapping skills in "The History of Rap." The skit was so good that it went on for three more installments!

Jimmy Fallon & Florence Welch, "Balls in Your Mouth"

Courtesy of YouTube

In response to the 2010 BP oil spill, Jimmy wrote a protest song about tarballs washing up on shore. When Hurricane Isaac caused the old tarballs from the spill to return, Jimmy sang the song again with the help of Florence Welch. Who knew a song about balls in your mouth could be so educational?

Jimmy Fallon, Christina Aguilera & The Roots, "Your Body"

Courtesy of YouTube

Next time you are bored at work, pick up your stapler and jam along to your favorite song! That's what Jimmy, Christina Aguilera and The Roots did when they sang "Your Body" with office supplies.

Neil Young (Jimmy Fallon) & Bruce Springsteen, "Whip My Hair"

Courtesy of YouTube

The Late Night host is known for his flawless impressions, so when he pretended to be a '70s Neil Young, it was almost believable! Jimmy brought in Bruce Springsteen to help him top off the catchy cover of Willow Smith's "Whip My Hair."

Jimmy Fallon & LMFAO, "The Spin Class Song"

Courtesy of YouTube

At your next spin class, get your body rocking to Jimmy and LMFAO's "The Spin Class Song." You won't miss a single spin with the upbeat tune and feel-good lyrics like "my legs are tired and my hair is sweaty, but it ain't no thing because I still look sexy."

Teresa Roca is an iVillage contributing writer. Follow her on Google+.

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