James Blake photo by Tom Spray; Justin Vernon photo by Natalie Kardos

Bon Iver's Justin Vernon and the National's Aaron Dessner are bringing the second Eaux Claires Music & Arts Festival back to Wisconsin on August 12-13. A cassette teasing the festival's lineup has reportedly been sent to early bird ticket holders, and as Consequence of Sound reports, one of the songs is by "Fall Creek Boys Choir." That's the name of a 2011 song by Vernon and James Blake.

Update (2/6, 5:45 p.m.): Eaux Claires' organizers have confirmed the tracklist. It includes a song by Bryce Dessner (Aaron Dessner's twin brother and fellow National member) with S. Carey and Justin Vernon. Vernon also has a song with his band Bon Iver, "Haven, Mass (B-Side)," as well as two songs with Aaron Dessner. The new Fall Creek Boys Choir song is called "Untitled 2." Check out the full tracklist below, via Kyle Matteson's Twitter.

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While the lineup hasn't been confirmed , the tape's purported leaked tracklist also features Bon Iver, Dessner, Bruce Hornsby, Jon Hopkins, Shabazz Palaces, Nathaniel Rateliff, Arcade Fire's Richard Reed Parry, Sarah Neufeld, Colin Stetson, My Brightest Diamond, William Tyler, Tenement, Buke and Gase, and more. Here's the festival's teaser:

Watch Vernon's band Volcano Choir perform "Comrade" on Pitchfork.tv's "City of Music":

Watch Blake perform "CMYK" at Pitchfork Music Festival 2011: