He delves into visual arts, literature, drama, and contemporary issues as meaningful sources of inspiration and challenge.

His music has been performed by Teatro del Maggio Musicale Fiorentino (Florence), Orchestra da Camera Fiorentina (Florence), Teatro Amazonas (Brazil), Dartmouth College (USA), Fondazione Cantiere Internazionale d'Arte & Ensemble degli Intrigati (Montepulciano), Altre Voci Ensemble (Italy), Ensemble di Musica Contemporanea Dallapiccola (Florence), DMC Ensemble at Scuola di Musica di Fiesole (Florence), DUOroboros (Tuscany), and Talea Ensemble (NYC).

In 2022-23, he taught composition and theory at the Shenandoah Conservatory and a course on contemporary classical music at the Peabody Institute of The Johns Hopkins University. Mr. Belli has also worked as a music director and accompanist in theaters, churches, and academia.