After graduating in 1940, he became violinist with the National Radio Orchestra of Romania, where he was noticed by the conductor, Willem Mengelberg; Voicu made his debut as a soloist with the orchestra soon after.
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The Bulandra Theatre (the Toma Caragiu stage, Sala Toma Caragiu), Ioanid Park (now called "Ion Voicu"), the Icoanei Church and the Anglican Church are located in the park's immediate vicinity.
Ilarion Ionescu-Galaţi played with soloists such as Lazar Berman, Radu Lupu, Fazil Say, Felicia Filip, Daniil Shafran, Igor Oistrakh, Valery Oistrach, Viktor Pikaisen, Rudolf Kerrer, Ion Voicu, Magda Tagliaferro, Idil Biret, Ayla Erduran, Sabine Meyer, Costas Cotsiolis, Aris Garoufalis, Theodore Kerkezos and several others.
Together with the orchestra, artists from Romania and other countries have performed, among them: Ion Voicu, Valentin Gheorghiu, Ștefan Ruha, Monique de La Bruchollerie and Jean Jaques Thiollier, Sviatoslav Richter, Rudolf Kerer, Lazar Berman, Dimitri Bashkirov, Ivry Gitlis, and Montserrat Caballé.