Jimmy, Sia and Natalie join the Roots for a special performance of the classic song "Iko Iko." Instrument list below:. Sia - vocals. Jimmy - spoons. Natalie - blocks. Questlove - kick drum, wood block. Kamal - conga drums. Frank Knuckles - plastic paint bucket. Mark Kelley - cups. Tuba Gooding Jr. - guiro. James Poyser - deck of cards. Captain Kirk - cue ball & 8 ball. Black Thought - maracas. Subscribe NOW to The Tonight Show Starring Jimmy Fallon:.