Passionate fandom has become the domain of pop music. Or, at least, that’s the image that has developed globally over the past decade, as intense groups of diverse people throw their support behind a wide range of mainstream acts, from Beyonce to BTS. Rock, once the hub for this type of devotion, doesn’t boast quite the same reputation anymore.

Save, perhaps, for in Japan, where rock music still has legs and can attract a passionate following. That much was clear on March 10, when the band Sid (stylized in all capital letters as SID) celebrated 15 years together at Yokohama Arena. Besides offering the chance to catch one of the more prolific Japanese groups of the 21st century, this big anniversary gig showed just how tight a connection many fans have with their favorite performers.

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