Watch the full concert at http://qello.com/concert/Live-at-the-Island-50-Festival-2859

Cat Stevens performs his song "Peace Train" live at the Island 50 Festival.

For decades, his has been the voice that has carried us through the darkness. One of the most influential and successful singer-songwriters of the last 40 years, Yusuf has provided the perfect salve for a troubled worlda beautifully nuanced, warm voice shielding us against harsh, turbulent times bringing songs of truth and hope.