D olly Parton, Emmylou Harris and Linda Ronstadt were three of the most gifted singers of the '60s and '70s, ... The cover of Trio (1987) Robert Alexander/Getty. How the Trio band was formed.

Fans and performers, in almost equal numbers, packed the room and stage in tribute to Emmylou Harris, the somewhat local girl who made a huge mark in the alt-country field long before anybody knew ...

The Life and Songs of Emmylou Harris: An All-Star Concert Celebration. Saturday at Constitution Hall. Saturday at Constitution Hall, 1776 D St. NW. 202-628-1776.