For more than 50 years, Mr. Seeger roamed America, singing on street corners and in saloons, migrant labor camps, hobo jungles, union halls, schools, churches and concert auditoriums. He helped write, arrange or revive such perennial favorites as “If I Had a Hammer,” “Where Have All the Flowers Gone?” and “Kisses Sweeter Than Wine” and popularized the anthem of the civil rights movement, “We Shall Overcome.”

Tall and reed-thin, Mr. Seeger was a recognizable figure for generations of listeners. And with dozens of top-selling records and albums, he became one of the most enduring and best-loved folk singers of his generation. He also was one of the few remaining links to two of the 20th century’s early giants of American folk music: Huddie Ledbetter, the black ex-convict from Texas and Louisiana better known as Lead Belly, and Woody Guthrie, the minstrel songwriter from Oklahoma.

Tough, tough news. He was a giant.