Midway through Modest Mouse’s Friday evening Rothbury set, frontman Isaac Brock recounted how he recently tried to tackle bandmate Tom Peloso because the bassist was “standing there all happy.” The failed attempt at channeling Bruce Smith left Brock with an injured arm and a possible concussion (”There was lots of blood,” he explained). But the singer’s aggression remained untamed as he ripped through songs like “Trucker’s Atlas” and the yelpy “Wild Packs of Family Dogs” with a boxer’s energy. Best of all might have been the band’s biggest hit, the chiming “Float On,” which the audience turned into a rowdy saloon sing-along.

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