Where is he now

In the late 1960s, a Mexican-American singer-songwriter is signed to a record label after two Motown producers see him performing in a seedy Detroit dive called The Sewer. He delivers two albums, which receive rave reviews (he is compared to Bob Dylan; some say he is better than Bob Dylan), but nobody buys them, so he drops from sight, and would have stayed dropped from sight, but for one remarkable twist: unbeknownst to him, particularly as he never saw any royalties, he had become a massive hit in apartheid-era South Africa, outselling both Elvis and the Rolling Stones....