On a corner in Midtown Mahattan, Alejandro Manzano, 27, waits patiently for his time in front of the camera. It’s a familiar spot for Alejandro, who, with his brothers Daniel, 32, and Fabian, 29, sings covers of hits on the Billboard Hot 100, as well as originals, on YouTube under the name Boyce Avenue. They’ve achieved all the hallmarks of major pop stars: sold-out European tours, studio time with top hitmakers, morning TV bookings — and more than $4 million in revenue last year.
Everything except mass face recognition. “What are you, in a band or something?” a passerby asks Alejandro. Well, yes. One soon to appear on Good Morning America to more than 5.4 million viewers, though Boyce Avenue performs for a larger audience on a weekly basis. The…