During Isabella’s lifetime, German composer Richard Wagner was at the epicenter of the classical music world. George Turner Phelps gave Isabella this libretto for Wagner's opera Parsifal. Isabella admired Wagner’s work and went to great lengths to see his performances. She traveled many times to Bayreuth, where Wagner hosted an annual music festival, and attended his operas in the United States and Europe. Isabella’s libretto from Phelps, along with a second libretto for Parsifal, are housed in the Vatichino.