Season 1, Episode 1 - Joey M. Martin, Director of Choral Activities at Texas State University

Season 1, Episode 2 - Tim Henderson, Washington State choir director and football coach

Season 1, Episode 3 - Lynn Brinckmeyer, former President NAfME

Season 1, Episode 4 - Derrick Brookins, Vice President & Vocal Chairman, TMEA

Season 1, Episode 5 - Mark Reynolds, TXST Opera Director

Season 1, Episode 6 - Gwyneth Walker, composer

Season 1, Episode 7 - Craig Hella Johnson, conductor & composer

Season 2, Episode 1 - James Cumings, Jackson Northwest Kidder Middle School, Michigan

Season 2, Episode 2 - Dr. Ralph Allwood, MBE former Precentor at Eton College,England. Music Director The Rodolfus Choir & Foundation

Season 2, Episode 3 - Dr. Robert Horton, Past-President TMEA

Season 2, Episode 4 - Dawn Reinhuber & Brigitte Smith, Directors of the San Marcos HS Men's Choir

Season 3, Episode 1 - Dr. Craig Jessop, conductor

Season 3, Episode 3 Samir Savant, director of the Handel London Festival

Season 3, Episode 2 - Dr. Deb Confredo, Temple University

Season 4, Episode 1: Z. Randall Stroope, conductor & composer

Season 4, Episode 2: Max Mendez, North Idaho College

Season 5, Episode 1 - Rosephanye Powell, Auburn University

Season 5, Episode 2 - Michael Barrett, University of Pretoria, South Africa