Soft, loud, soft. Mogwai’s irrepressible wall of sound has been wailing out of amplifiers for three decades, unbowed, undented by fluctuations in pop culture. Undefeated. The Scottish post-rockers are a sonic force of nature, a swirling hurricane of guitars. Sometimes heavy, sometimes not. Soft, loud, soft.

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Formed in Glasgow back in 1995, the four-piece stopped by the Sydney Opera House last weekend for the ultimate 30th birthday bash (well, 31 now, but who’s counting).

From the very start, Mogwai has been independent. DIY, even. “Once in a while” the major music companies would come knocking, frontman Stuart Braithwaite tells Billboard backstage ahead of the concert, a production for Vivid LIVE. “Yeah, well,” he points out, “we are completely indie, you know.”