In preparation for the 30th anniversary of The Black Album , Metallica is working on an album that will feature over 50 artists performing tracks from the record, as well as a complete remaster of the album and rare recordings.

This Wednesday, the 7th, the group released a recording of “Holier Than Thou” that took place in 1990 during a studio rehearsal in the pre-production phase of The Black Album . The recording, which you can listen to here, was recorded on October 4, 1990, and features the instrumental part of the group's creation.

Now, the group has shared a cover of “Holier Than Thou” recorded by Biffy Clyro and another by OFF!, which you can listen to below.

Metallica has also released a demo from the same period as "Enter Sandman ," which was recorded in Lars Ulrich , as well as an alternate version of "Sad But True ." All of these new releases will be available in full on September 10th, along with a book featuring photos from the time of the album's recording – learn more here.

The Blacklist , a tribute album featuring over 50 artists, included a version of "Nothing Else Matters" Miley Cyrus and Elton John Juanes , and two versions of "Sad But True," the first by Jason Isbell and the 400 Unit and the second by St. Vincent.

READ ALSO: All Metallica album covers, from worst to best; see the ranking

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A music journalist for 8 years, she is the editor of Wikimetal, where she combines her two great passions: music and writing. She believes that heavy music deserves to be everywhere and seeks to make that a reality. Slipknot, Evanescence, and Bring Me The Horizon are essential to her playlist.