Happy Birthday, Jimmy Fallon! Watch His 5 Best 'Tonight Show' Music Moments

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Jimmy Fallon performing on "The Tonight Show Starring Jimmy Fallon."

It's no secret that former Saturday Night Live star Jimmy Fallon is great at impressions.

Over his years on SNL and Late Night With Jimmy Fallon, he debuted perfect musical imitations of everyone from Bruce Springsteen to Neil Young. When he wasn't imitating one of the greats, he was performing with modern music stars, such as buddy Justin Timberlake in the duo's iconic "History of Rap" videos.

In honor of Fallon's 40th birthday today, Billboard looked back over his past eight months on the Tonight Show, and came up with five of our favorite musical moments from the show. Check them out below, and be sure to tell us your own faves in the comments. 

5.) Barbra Streisand Duets With Jimmy Fallon, Sept. 15

4.) Broadway Versions of Rap Songs with Anne Hathaway, April 8

3.) "Let It Go" with Idina Menzel and The Roots, Mar. 2

2.) Lip Sync Battle with Emma Stone, April 28. 

1.) "Neil Young" Sings "Fancy," July 6