Théo Charlier studied under Dieudonné Gérardy and Sylvain Dupuis at the Royal Conservatory of Liège.
He played solo trumpet for the Antwerp Symphony Orchestra and at La Monnaie in Brussels, Belgium.
[3] He was the founder of the Schola Musicae institute for higher musical education.
[4] Charlier wrote Solo de Concours in 1900, and it is still performed to this day.
By far, his most famous work is 36 Études Transcendantes (Thirty-six Transcendental Etudes), a staple in trumpet instruction.