it could be the shadow of a contrail, which is a vapor trail produced by jet engines. The National Weather Service says: "Condensation trails, commonly called contrails, are narrow cirrus cloud ...

Shadows of Clouds was written for the inaugural Chigiana Summer Composition Program with Richard Danielpour and the Carpe Diem String Quartet, and premiered in Siena, Italy on June 28th, 2019. The ...