System of a Down‘s Serj Tankian and The Strokes‘ Julian Casablancas are among over 600 artists signing an open letter in support of Palestine and calling for a boycott of “Israel’s complicit cultural institutions.” “As musicians, we cannot be silent. Today it is essential that we stand with Palestine,” the letter begins. “We are calling on our peers to publicly assert their solidarity with the Palestinian people. Complicity with Israeli war crimes is found in silence, and today silence is not an option.” “We call for you to join us with your name in refusing to perform at Israel’s complicit cultural institutions, and by standing firm in your support of the Palestinian people and their human right to sovereignty and freedom,” the letter continues. “We believe this is crucial to one day live in a world without segregation and apartheid.”