What is the fine-grained topic of the following text: Back in December of last year, it was revealed that former Black Sabbath bassist, GEEZER BUTLER had joined forces with guitarist STEVE STEVENS (Billy Idol), drummer MATT SORUM (Guns N' Roses), and singer FRANKIE PEREZ (Apocolyptica) to form the new band, DEADLAND RITUAL. Only return the topic.
Formation of the band DEADLAND RITUAL