Voice Teacher Eric Vetro Is Hollywood’s Not-So-Secret Weapon

The walls of Eric Vetro’s studio are lined with keepsakes and mementos. In one corner, Ariana Grande’s first ever platinum record sits not far from a translucent guitar designed by Shawn Mendes. In between hangs a gold record from Sabrina Carpenter. On the opposite wall, platinum records from Mendes and his ex-girlfriend Camila Cabello sit atop each other, next to other plaques from Rosalia and Becky G. Beside his “wall of selfies”—hundreds of pictures of Vetro and his favorite…