Inaugurated in 1891, it now has 7,000 pipes with the longest one stretching over 32 feet (9.75 m) and the smallest one at a quarter-inch long (6.35 mm).

Notre-Dame Basilica is known for its exceptional acoustics. Many artists have performed under its vault, including the Orchestre symphonique de Montréal and Luciano Pavarotti.

Throughout the year, several celebrations in the liturgical calendar are accompanied by the organ and often by hymns and activities.