"Gregg Almond" sits in with the Roots to perform tribute song to his identical twin cousin, Randy
Singer-songwriter also helped parody classic tracks by Simon & Garfunkel, Adele with #FallSongs segment
Singer and actress went back to 'Hannah Montana' roots on 'Tonight Show'
Singer performs "Baby, I'm in the Mood for You," addresses host's Donald Trump controversy
Rocker delivers "Love Is the Truth" and "You've Got Her in Your Pocket," trash-talks Jimmy Fallon's guitar
Singer also played Best Friend Challenge with 'Tonight Show' host
Pair perform rare, horse-heavy version as Tom Petty, Jeff Lynne on "First Drafts of Rock"
'Sausage Party' star recruits the Roots to assist him on "Mellow My Man"
Pair revive "First Textual Experience" bit based on comedian's book 'Modern Romance'
Singer gives visually striking performance of atmospheric new single with Roots
Actor recalls taking his family to see the Purple One in London and meeting him backstage
Grammy-winning singer flipped hair over her head for the full Sia experience
Australian singer recently re-released single with a new verse from Alessia Cara
Singer and late-night host lip-synced to "Into You" while testing out various filters
Duo united on 'Tonight Show' for hopeful "Love Make the World Go Round," dedicated to victims of Pulse shooting