Earth, Wind & Fire are known for their chart-topping pop-R&B anthems. But when they hit the stage, a full-on funkathon explodes. Recorded in 1975 at gigs across eight U.S. cities, Gratitude launches to the sound of host Perry Jones introducing Maurice White's well-oiled machine. From there, the upbeat "Africano/Power" gets the party started right. Smooth respite comes from tender quiet-storm ballads "Devotion" and "Reasons," while a joyous, punchy take on "Celebrate" ends the night on a euphoric note.