The Marrow of a Bone is the sixth studio album by Japanese heavy metal band Dir En Grey and the first to use an all caps capitalization. It was released on February 7, 2007, in Japan, and in the United States, Germany, France, and the United Kingdom in the following months. In total, the album was released in eleven countries. The band was touring North America at the time of the album's release in both Japan and the United States. In March 2007, The Marrow of a Bone reached number 21 on Billboard's "Top Independent Albums" chart.

Dir En Grey is a Japanese heavy metal band formed in February 1997 and currently signed to Firewall Div., a sub-division of Free-Will. With a consistent lineup of guitarists Kaoru and Die, vocalist Kyo, drummer Shinya and bassist Toshiya, they have released eleven full-length albums. Numerous stylistic changes have made the genre of their music difficult to determine, though it is generally considered to be a form of metal. Originally a visual kei band, the members later opted for more subtle attire, but have continued to maintain a dramatic image on stage.