Dir en grey has been played on NTS shows including Bo Ningen, with Filth first played on 29 October 2019.

Dir En Grey (stylised as DIR EN GREY and formerly as Dir en grey) is a Japanese heavy metal band formed in February 1997. The group is signed to Firewall Div., a sub-division of the independent label Free-Will. The band's lineup has remained consistent, comprising vocalist Kyo, guitarists Kaoru and Die, bassist Toshiya, and drummer Shinya. They have released eleven full-length studio albums.

The band is known for its evolving musical style, which has made its genre classification complex, though their work is generally regarded as a form of metal. Dir En Grey originally emerged as part of the visual kei movement, a Japanese music scene known for elaborate and flamboyant aesthetics. Over time, the band moved towards a more restrained visual presentation, while continuing to maintain a theatrical presence during live performances.