The Covid-19 has turned musical life upside down. The closure for several months of concert halls around the world put a halt to the entire sector. In their confinement, the artists, after the dismay of the first days, began to find other means of expression: concerts on the balcony, online videos, but also writing. This collection brings together the letters of thirteen composers or performers confined: Tomás Bordalejo, Sébastian Ené, Hélène Fouquart, Jodyline Gallavardin, Grégoire Girard, Vincent Lhermet, Benoît Menut, Alex Nante, Camille Pépin, Astrig Siranossian and the Karenine trio. These musicians, laureates of the Banque Populaire Foundation, deliver poetic, social and political reflections in turn. Beyond confinement, they share their thoughts on the world after. How to rethink musical practice after this health crisis?