The average T-shirt breakdown at a Metallica concert goes something like this: 94 percent Metallica shirts, 2 percent Iron Maiden, 2 percent Black Sabbath, 1 percent Slayer, 1 percent Slipknot and .00001 percent Britney Spears/Taylor Swift. (You always have that one guy being ironic with his shirt choice.)

The fact that there were far more button-ups and polos than concert T’s to be seen in the Metallica crowd on Wednesday night — probably by a ratio of 100:1 — clearly underscored that the biggest Bay Area band of all time wasn’t playing one of its regular shows at Chase Center in San Francisco.

No, the hard-hitting quartet — featuring vocalist-guitarist James Hetfield, drummer Lars Ulrich, lead guitarist Kirk Hammett and bassist Robert Trujillo — had arrived to perform a massive corpora

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