When vocal coach Eric Vetro was introduced to a then 13-year-old actress named Ariana Grande, his first thought was “superstar.” “The voice, the personality, the charisma, it was all there… Anything you see of her now really was there already,” he tells Billboard. Since that fateful day, Vetro has become “like family” to the Grandes, spending several holidays together and honing young Grande’s voice to meet every career milestone that lay ahead — from recording her breakout hit “Dangerous Woman” to transforming into Glinda for Wicked.

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Vetro has become the go-to voice maestro for just about everyone in the entertainment business, ranging from ROSÉ to Rosalía, and he’s become especially adept at teaching actors how to prepare for musical biopics. He’s helped Jacob Elordi and Austin Butler prepare to play Elvis, Timothée Chalamet to play Bob Dylan, Angelina Jolie to portray Maria Callas, Jeremy Allen White to do Bruce Springsteen and more. And, to top it off, he’s also been a guide for Broadway stars like Lea Michelle and Bette Midler.

On this week’s episode of Billboard On the Record, Vetro joins the podcast to explain this little-explored — but crucial — role in the music industry, helping stars maintain their voices despite often stressful, demanding schedules.