As anyone who’s seen “Walk Hard: The Dewey Cox Story” knows, John C. Reilly has got serious pipes. And on one Monday in October, at Livermore’s Bankhead Theater, he’ll show them off in a heartfelt way for his world-traveling musical, “Mister Romantic.”

Equal parts vaudeville, singing and storytelling, the show follows the titular character’s journey through the “Great American Songbook” — a loosely defined collection of ever-golden songs and jazz tunes from the early 1900s. Think Irving Berlin, Johnny Mercer and Glenn Miller – then with Tom Waits thrown in, because why not? — filtered through the Academy Award-nominated actor’s honey-soaked voice. Backing him up are a musical group of Grammy winners including Davíd Garza, who’s worked with John Legend and Fiona Apple, and Gabe Witcher of

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