A sea of flags covers the crowd at Glastonbury Festival in Somerset, England, June 2025. Ben Birchall/PA Images via Getty Images Musical activism is nothing new. Think of Jimi Hendrix protesting the Vietnam War at Woodstock with his distorted, electronic take on the "Star-Spangled Banner." So it should come as no surprise that the most contentious political issue of our time - the ongoing war in Gaza - is being voiced, debated and fought over on stages at music festivals and in clubs worldwide.