[5] As a violinist, Fusi has been a member of the Lucerne Festival Academy from 2007 till 2011,[6] working with Pierre Boulez, Alan Gilbert, Péter Eötvös and Susanna Mälkki.
[14] In 2020 Fusi and Billone worked together on a performance of Luigi Nono's La lontananza nostalgica utopica futura, presented by the Ensemble Vide in Geneva.
[17] In 2015, Fusi was invited to perform Helmut Lachenmann's Toccatina for solo violin at Festival Attacca in Stuttgart during Lachemnann's 80th birthday celebrations.
[20] Fusi frequently performs on the viola d'amore and has commissioned new works for the instrument, contributing to the development of its existing repertoire.
Fusi has worked with and premiered new viola d'amore pieces by Christopher Trapani,[21] Bára Gísladóttir,[22] Lorenzo Romano, Laura Steenberge, Zeno Baldi, Bergrún Snæbjörnsdóttir, Giovanni Verrando, Julie Zhu, Carlo Ciceri.