Overview

Synopsis

Philip Glass’s Galileo Galilei tells the story of the great astronomer and scientist in reverse chronological order, beginning with him as an old man under house arrest, blind and silenced by the Inquisition. The opera moves backward through key moments in his life, including his trial, his clashes with Church authority, his scientific discoveries, and the personal struggles he endured for defending his beliefs. These scenes capture Galileo’s isolation, his brilliance, and the tension between science and faith in a world resistant to change.

The opera culminates in Galileo’s childhood, as he attends a performance of an opera written by his father, Vincenzo Galilei. This final scene highlights both the continuity of artistic and intellectual inquiry within his family and the sense of wonder that shaped Galileo’s imagination from the beginning. By traveling backward in time, Glass frames Galileo’s life as a meditation on memory, legacy, and the eternal human quest for truth.

Show Information

Music
Category
Opera
Age Guidance
Youth (Y)/General Audiences (G)
Number of Acts
1
Genres
Historical/Biographical, Drama, Tragedy
Settings
Multiple Settings, Period
Time & Place
Set in seventeenth-century Italy, moving backward through Galileo’s life from old age in forced blindness to his childhood watching opera with his father.
Cast Size
medium
Orchestra Size
Small
Dancing
Optional
Ideal For
Chamber Opera, College/University, Professional Opera, Professional Theatre, Regional Theatre, Ensemble Cast, Mature Audiences, Mostly Male Cast, Includes Mature Adult, Elderly, Adult, Young Adult, Late Teen Characters, Medium Cast

Context

Plot


Characters

Name Part Size Gender Vocal Part

Galileo Galilei (Old)

Lead

Male

Baritone

Galileo Galilei (Middle-Aged)

Lead

Male

Tenor

Galileo Galilei (Young)

Lead

Male

Tenor

Cardinal Barberini / Pope Urban VIII

Supporting

Male

Bass, Baritone

Maria Celeste

Supporting

Female

Soprano

Sagredo

Featured

Male

Baritone

Vincenzo Galilei

Featured

Male

Baritone, Tenor

Cosimo de’ Medici

Featured

Male

Tenor

Clergy / Inquisitors

Ensemble

Male

Baritone, Bass

Opera Performers (from Il Conte)

Ensemble

Not Specified

Songs

Act I

Notes

The opera moves backward in time, so the opening is Galileo in blindness and isolation, and the closing shows him as a child inspired by his father’s music.

Many roles are doubled or tripled in performance. For instance, the same singer may portray Cardinal Barberini and Pope Urban VIII, or multiple ages of Galileo may be cast with related voice types.

A song with an asterisk (*) before the title indicates a dance number.

Monologues

All monologues are the property and copyright of their owners.. Monologues are presented on StageAgent for educational purposes only. If you would like to give a public performance of this monologue, please obtain authorization from the appropriate licensor.

Scenes

All scenes are the property and copyright of their owners. Scenes are presented on StageAgent for educational purposes only. If you would like to give a public performance of this scene, please obtain authorization from the appropriate licensor.

Key Terms

    A genre of drama based on real people’s lives, exploring their challenges, accomplishments, and inner conflicts.

    A chamber opera is a small-scale opera typically written for a modest cast and reduced instrumental ensemble, designed for performance in intimate venues rather than large opera houses. These works often emphasize clarity of text, intimacy of storytelling, and flexibility of staging. Because of their size, chamber operas are especially popular with universities, regional companies, and groups exploring contemporary or experimental repertoire.

    A theatrical style that emphasizes simplicity in staging and dialogue to focus attention on core themes and performance.

    A style of vocal delivery in opera where the singer adopts the rhythms of ordinary speech. It advances plot between arias and provides narrative context.

    A tableau is a staged moment where performers freeze in a visually powerful pose or arrangement, almost like a living picture. Instead of dialogue or movement, the image itself communicates the meaning—whether it’s celebrating triumph, mourning loss, or showing a turning point in the story. In an opera such as Ça Ira, which dramatizes the French Revolution, tableaux are often used to symbolize big events like the storming of the Bastille or the collective spirit of the people.

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Guide Written By:

Jason Engleman

Jason Engleman

Humming show tunes day and night.