What makes At His Best by Sixto Rodriguez notable?

Though initially overlooked in the United States, 'At His Best' became significant for its later impact on anti-apartheid movements in South Africa, where tracks like 'Sugar Man' gained massive popularity. The album has since been recognized for its role in highlighting social issues through music, earning renewed interest decades later. Released in 1977, 'At His Best' was Rodriguez's second album, following his self-titled debut. At this time, he remained relatively unknown in the U.S. but had gained an unexpected following in South Africa, where his music resonated deeply with audiences amidst political struggles.