Mary Travers, the female star of the folk trio "Peter, Paul and Mary" died last week, aged 72. Many of the group's songs are part of the eternal American hit parade, and once you've heard their particular sound, you probably won't forget it.
There is a rather detailed obituary at the New York Times site, and of course YouTube has a number of songs to offer, among them Peter, Paul and Mary's version of the Bob Dylan Song "Blowin in the wind".
Puff, the Magic Dragon
Where Have All the Flowers Gone?"