First Aid Kit (band)
Guest appearances

Year
Song
Artist
Album
2009
"Ten Seconds", "Armour", "Song No. 6" (as choir members)
Ane Brun
Live At Stockholm Concert Hall, CD+DVD
2009
"Summer Rain" (Acoustic DVD version)
Anna Ternheim
Leaving on a Mayday, 2CD+DVD box set
2011
"We're Going to Be Friends"
Bright Eyes
Cool for School: A Benefit for the Lunchbox Fund
2011
"Do You Remember"
Ane Brun
It All Starts with One
2012
"Godnatt"
Bröderna Lindgren
I Tiden
2012
"Glad That You Called", "Elbow In Your Face", "The Horoscope Song", "Numbers", "The Swimming", "When Will You Notice Me In The Crowd"
Blood Music
The Fire And The Flame
2014
"Time Forgot", "Hundreds of Ways", "Double Life", "Kick", "Night at Lake Unknown", "Governor's Ball"
Conor Oberst
Upside Down Mountain
2014
"The Voyager"
Jenny Lewis
The Voyager
2017
"Moving Slow", "Golden", "Little Less Blue"
Jesper Lindell
Little Less Blue (EP)
2017
"Du Fria"
Håkan Hellström
Du Fria (Rullande Åska Live) single
2018
"Revolution" (Released as single already in 2016)
Van William
Countries
2018
"Ether & Wood"
Alela Diane
Cusp
2018
"Savior"
George Ezra
Staying at Tamara's
2018
"Goldwing"
Little Jinder
Hejdå

Question: Which guest appearances did First Aid Kit make in 2018?
Answer: First Aid Kit appeared in 2018's Van William's song "Revolution" on the Countries Album, Alela Diane's song Ether & Wood, off her album Cusp, in George Ezra's song Saviour, on his album Staying at Tamara's and in Little Jinder's song Goldwing, on her album Hejdå.