The Gros 4 is a collaboration, for a joint tour, of four leading figures in the French metal scene: No One Is Innocent, Tagada Jones, Ultra Vomit, and Mass Hysteria.
On April 1, 2022, The Gros 4 set up their flight cases at the Zénith in Strasbourg. This entire evening is captured in a limited edition box set, featuring 4 CDs and 2 DVDs or 2 Blu-rays, along with the tour poster.
Expect 4 hours of live performance, showcasing 60 songs with a fresh mix by Fred Duquesne, including numerous classics such as "La peau," "Mort aux cons," "Kammthaar," and "L’enfer des dieux," to name one from each band. Additionally, there's an exclusive new track from Ultra Vomit dedicated to Mouss, the singer of Mass Hysteria, titled "Mouss 2 Mass."