Tortoise is eyeing an April release for a three-disc set of 33 rare tracks via Thrill Jockey.

Tortoise is eyeing an April release for a three-disc set of 33 rare tracks via Thrill Jockey. According to a label spokesperson, the project was originally titled "Rhythms, Resolutions and Clusters" (after the group's 1995 remix album) but will most likely wind up with another name.

In addition to a DVD whose contents have yet to be solidified, the collection will feature two audio discs full of hard-to-find remixes by the likes of Autechre, Yo La Tengo and Mike Watt as well as the contents of the original "Rhythms, Resolutions and Clusters."

Watt's recasting of "Cornpone Brunch" was intended to appear on that album, but the master DAT tape arrived damaged in the mail just before mastering. Unable to obtain a usable copy before time ran out, Tortoise sat on the broken tape for a decade until longtime collaborator Bundy K. Brown was recently able to resurrect it for use on the upcoming boxed set.

In addition, the audio discs will include tracks from such compilations as the Joy Division tribute "A Means to an End," "Offbeat: A Red Hot Sound Trip," "Chicago 2018: It's Gonna Change" and "Lounge Ax Defense & Relocation CD," plus limited-edition tour singles and EP cuts such as "Goriri" and "Gamera," two of the group's best non-album songs.

As previously reported, Tortoise's collaborative covers album with Will Oldham (as Bonnie "Prince" Billy), "The Brave and the Bold," is due Jan. 24 via Overcoat Recordings. The group is also working on material for a new Tortoise album, which could be out by the end of the year.

"We're trying to get away from playing so many 'songs" and just focus on more rhythmic or ethereal aspects in the music," guitarist Jeff Parker tells Billboard.com. "In a way, as a band, we get kind of trapped into creating these songs that have verse, chorus and melody -- musical relationships that work that way. It's something we're trying to get away from. We're not even actually sure what we mean by that, but it's something we've noticed is kind of absent in a general sense from our music. It's something we'd like to cultivate."