Brazilian singer-songwriter Milton Nascimento at Lisner Auditorium

In recent years, Milton Nascimento has consistently gotten mixed reviews. The Brazilian singer-songwriter, who performed Thursday night at George Washington University's Lisner Auditorium, doesn't employ his famous falsetto much anymore, and he certainly can't dance. The dreadlocked performer, who turned 72 last month, lumbered onto the stage gingerly and moved little as he sang. Yet those were minor disappointments, since Nascimento's high tenor still sounds pure and ethereal, and his youthful ...