ISABELLE KOSEMPA,
mezzo-soprano.
2025/26 SCHEDULE.
Masterclass with John Churchwell
July 5, 2025 | Napa Valley College Performing Arts Center
​Isabelle will offer Charlotte's "Air des lettres" from Massenet's Werther and
Olga's aria from Tchaikovsky's Eugene Onegin.
​​
​
​
Festival Live! Vocal Recital
July 9, 2025 | 11:00 AM PT | The CIA at Copia Amphitheater, Napa
This lively concert features the Manetti Shrem Opera Fellows, accompanied by a chamber ensemble of students and faculty from The Frost School at Festival Napa Valley's Blackburn Music Academy.
​
Isabelle will perform Charlotte's "Air des lettres" from Massenet's Werther.
​
​
​
Heggie's The Judgment of Paris (workshop)
July 14, 2025 | Stags' Leap Winery, Napa
The Judgement of Paris (1976) was a blind tasting where California wines beat top French wines, shocking the wine world and proving New World wines could rival Europe’s best. ​Isabelle originates the role of Patricia Gallagher in the workshop of the prologue of The Judgment of Paris, a brand new opera by Jake Heggie. She and the rest of the artists will work closely with the composer.
​
​
​
Vintner's Luncheon
July 18, 2025 | PlumpJack Estate Winery, Napa
​Isabelle will be performing in the ensemble of a scene from Plump Jack, with composer Gordon Getty in the audience.
​
​
​
Opera Scenes with Manetti Shrem Opera Fellows
July 16, 2025 | 6:30 PM PT | The CIA at Copia Amphitheater, Napa
The 2025 Manetti Shrem Opera Fellows perform a showcase of favorite opera scenes together with Festival Orchestra Napa.
​
Isabelle will perform as Dorabella in “Il core vi dono” from Mozart's Così fan tutte and Leonora in a duet from Donizetti's La Favorita.​
​
​
​
Martinů's Mariken de Nimègue with Bard Music Festival
August 15, 2025 | Fisher Center at Bard, Sosnoff Theater
This performance is a world premiere of the original French version of Bohuslav Martinů’s one-act opera Mariken de Nimègue (“Mary of Nijmegen”) featuring different orchestration as well as extensive original musical material that has never previously been published or performed.
​Isabelle will perform the role of Notre Dame under the baton of Zachary Schwartzman.​
​
​
​
Martinů's Julietta with Bard Music Festival
August 17, 2025 | Fisher Center at Bard, Sosnoff Theater
The Bard Music Festival draws to a gripping close with a performance of Bohuslav Martinů’s Julietta, his enigmatic eighth opera. Under the masterful direction of Leon Botstein, the American Symphony Orchestra brings to life a surreal psychological drama that blurs the boundaries between dreams and reality.
​Isabelle will perform the roles of Young Arab, First Man, Young Sailor, and Bellhop.​
​
​
​
Verdi's Falstaff with Shepherd School Opera
April 17, 19, & 21, 2026 | Morrison Theater at Brockman Hall for Opera
​Isabelle performs the role of Meg Page in Verdi's final opera.
​
​
​
PAST HIGHLIGHTS.