JAFFA, Israel — Members of the local women’s choir arrived for rehearsal one recent Tuesday with baked goods and hugs. They stretched, massaged each other’s shoulders and backs, then took their places — altos on one side of the room, sopranos on the other — to align their posture, synchronize their breathing and warm their voices up together. I breathe freedom; don’t take my air, they sang in Arabic, starting a Lebanese tune they’d been practicing for months. Don’t push too hard or we will fall...