[1] Making his debut in Mireille on 5 September 1878, Soulacroix appeared regularly at La Monnaie, Brussels, including in some local operatic premieres.
He sang Ford in the 1894 production of Falstaff, as well as Alfio (Cavalleria rusticana), Ourrias (Mireille), Schaunard (La Boheme) and Figaro (The Barber of Seville).
In addition, he was seen in a wide range of parts regularly at Monte Carlo from 1889 to 1904, including the title role in Zampa and Iago in Otello.
Early cylinder and disc recordings by Soulacroix include arias from Rip, Richard Cœur-de-Lion, La Favorite, Hérodiade, Si j’étais roi and Carmen, as well as from roles which he created: "A ton amour simple et sincère" and "Quand tu connaîtras Colette" from La Basoche, and the 'Air du prieur' from Le jongleur de Notre-Dame.
According to Michael Scott in The Record of Singing, they show that "he possessed a smooth, elegant, lyrical voice and an exemplary bel canto technique".