What makes Ultra Soul by B'z notable?

'Ultra Soul' became a massive hit in Japan, topping the Oricon charts and solidifying B'z's status as rock icons. Its impact was evident as it introduced a new generation to their music while also influencing the J-rock scene in the early 2000s. Released on March 14, 2001, 'Ultra Soul' marked B'z's transition into a more mainstream sound following their previous album, 'Brotherhood.' By this time, they had already established themselves as one of Japan's top rock acts, making this album a significant continuation of their commercial success.