What makes Gold by B'z notable?

'Gold' debuted at number one on the Oricon charts and remained there for multiple weeks, exemplifying B'z's dominance in the Japanese music scene. The album features hits like 'GOLD' and 'ultra soul', which became staples in their live performances, further influencing the pop-rock genre in Japan during the early 2000s. Released on August 8, 2001, 'Gold' came after B'z achieved massive success with their previous albums, solidifying their status as rock icons in Japan. This album marked a continuation of their commercial peak, following the successful 'Brotherhood' in 2000, and showcased their evolution into more melodic pop-rock territories while retaining their hard rock roots.