Work began over four years ago for the 59-track, nearly-six hour collection.
The set is due to release May 20, 2016 via 4AD.
Album artwork and full track listing is below.

Credit: Shervin Lainez
Thunder
(Vol.1)
01.
Touch of Grey The War on Drugs
02.
Sugaree Phosphorescent, Jenny Lewis & Friends
03.

Candyman Jim James & Friends
04.
Cassidy Moses Sumney, Jenny Lewis & Friends
05.
Black Muddy River Bruce Hornsby and DeYarmond Edison
06.
Loser Ed Droste, Binki Shapiro & Friends
07.
Peggy-O The National
08.
Box of Rain Kurt Vile and the Violators (featuring J Mascis)
09.
Rubin and Cherise Bonnie Prince Billy & Friends
10.
To Lay Me Down Perfume Genius, Sharon Van Etten & Friends
11.
New Speedway Boogie Courtney Barnett
12.
Friend of the Devil Mumford & Sons
13.
Uncle Johns Band Lucius
14.
Me and My Uncle The Lone Bellow & Friends
15.
Mountains of the Moon Lee Ranaldo, Lisa Hannigan & Friends
16.
Black Peter Anohni and yMusic
17.
Garcia Counterpoint Bryce Dessner
18.
Attics of My Life Angel Olsen
20.
St. Stephen (live) Wilco with Bob Weir
Lightning
(Vol.
If I Had the World to Give Bonnie Prince Billy
02.
Standing on the Moon Phosphorescent & Friends
03.
Cumberland Blues Charles Bradley and Menahan Street Band
04.
Ship of Fools The Tallest Man on Earth & Friends
05.
Bird Song Bonnie Prince Billy & Friends
06.
Morning Dew The National
07.
Truckin Marijuana Deathsquads
08.
Dark Star Cass McCombs, Joe Russo & Friends
09.
Nightfall of Diamonds Nightfall of Diamonds
10.
Transitive Refraction Axis for John Oswald Tim Hecker
11.
Going Down The Road Feelin Bad Lucinda Williams & Friends
12.
Playing in the Band Tunde Adebimpe, Lee Ranaldo & Friends
13.
Stella Blue Local Natives
14.
Eyes of the World Tal National
15.
Help on the Way Bela Fleck
16.
Franklins Tower Orchestra Baobab
17.
Till the Morning Comes Luluc with Xylouris White
18.
Ripple The Walkmen
19.
Brokedown Palace Richard Reed Parry with Caroline Shaw and Little Scream (featuring
Garth Hudson)
Sunshine
(Vol.
Here Comes Sunshine Real Estate
02.
Shakedown Street Unknown Mortal Orchestra
03.
Brown-Eyed Women Hiss Golden Messenger
04.
Jack-A-Roe This Is the Kit
05.
High Time Daniel Rossen and Christopher Bear
06.
Dire Wolf The Lone Bellow & Friends
07.
Althea Winston Marshall, Kodiak Blue and Shura
08.
Clementine Jam Orchestra Baobab
09.
China Cat Sunflower -> I Know You Rider Stephen Malkmus and the Jicks
10.
Easy Wind Bill Callahan
11.
Wharf Rat Ira Kaplan & Friends
12.
Estimated Prophet The Rileys
13.
Drums -> Space Man Forever, So Percussion and Oneida
14.
Cream Puff War Fucked Up
15.
Dark Star The Flaming Lips
16.
Whats Become of the Baby s t a r g a z e
17.
King Solomons Marbles Vijay Iyer
18.
Rosemary Mina Tindle & Friends
19.
And We Bid You Goodnight Sam Amidon
20.
I Know You Rider (live) The National with Bob Weir