A 1982 hit later called ‘the most complex pop song of all time’ is celebrating its anniversary today, thanks to its unusual structure and lasting chart success.Released on April 14, 1982, “Never Gonna Let You Go” by Sérgio Mendes has become one of the most unlikely chart hits of its era—and one of the most musically intricate. The song, written by legendary songwriting duo Cynthia Weil and Barry Mann, was first recorded by Dionne Warwick before Mendes released his now-definitive version in 1983, featuring vocalists Joe Pizzulo and Leeza Miller. It went on to become a major hit, reaching No....