alongsideOzzy on Patient Number 9, we also find Tony Iommi (for the first collaboration of the two men outside of Black Sabbath), Josh Homme (Queens of the Stone Age), Mike McCready (Pearl Jam), Chad Smith (Red Hot Chili Peppers), Duff McKagan (Guns N’ Roses), Robert Trujillo (Metallica) et Zak Wylde who collaborates with Ozzy on stage and in the studio since 1988. The album finally includes the last recorded performance of the late Taylor Hawkins.