Backstreet Boys fans who couldn't get tickets to the band's residency at the Sphere shouldn't be too bummed ... as BSB member Howie Dorough just gave an impromptu performance while out and about in ...
Still, the Barbershop is known for having its fair share of surprise performances ... with the likes of Bruno Mars, Sir Rod Stewart, Sammy Hagar, among others hitting the intimate venue's stage over ...
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