![Alt-J-Roots-Screengrab-Crop-480x270-1](https://utterbuzz.com/wp-content/uploads/2019/03/Alt-J-Roots-Screengrab-Crop-480x270-1-640x360.jpg)
![](https://utterbuzz.com/wp-content/uploads/2019/03/Alt-J-Roots-Screengrab-Crop.jpg)
Watch alt-J get the help of The Roots during their performance on last night’s episode of the ‘The Tonight Show Starring Jimmy Fallon.’
Watch alt-J get the help of The Roots during their performance on last night’s episode of the ‘The Tonight Show Starring Jimmy Fallon.’