Peter "Pete" Seeger was an American folk singer. A fixture on nationwide radio in the 1940s, he also had a string of hit records during the early 1950s as a member of The Weavers, most notably their recording of Lead Belly's "Goodnight, Irene", which topped the charts for 13 weeks in 1950

.Members of The Weavers were blacklisted during the McCarthy Era. In the 1960s, he re-emerged on the public scene as a prominent singer of protest music in support of international disarmament, civil rights, counterculture and environmental causes.

As a song writer, he was best known as the author or co-author of "Where Have All the Flowers Gone?" (with Joe Hickerson), "If I Had a Hammer (The Hammer Song)" (composed with Lee Hays of The Weavers), and "Turn, Turn, Turn!", which have been recorded by many artists both in and outside the folk revival movement and are still sung throughout the world. "Flowers" was a hit recording for The Kingston Trio (1962); Marlene Dietrich, who recorded it in English, German and French (1962); and Johnny Rivers (1965). "If I Had a Hammer" was a hit for Peter, Paul & Mary (1962) and Trini Lopez (1963), while The Byrds popularized "Turn, Turn, Turn!" in the mid-1960s, as did Judy Collins in 1964, and The Seekers in 1966.

Seeger was one of the folksingers most responsible for popularizing the spiritual "We Shall Overcome" (also recorded by Joan Baez and many other singer-activists) that became the acknowledged anthem of the 1960s American Civil Rights Movement, soon after folk singer and activist Guy Carawan introduced it at the founding meeting of the Student Nonviolent Coordinating Committee (SNCC) in 1960. In the PBS "American Masters" episode Pete Seeger: The Power of Song, Seeger states it was he who changed the lyric from the traditional "We will overcome" to the more singable "We shall overcome"

Seeger was born at the French Hospital, Midtown Manhattan.

His Yankee-Protestant family, which Seeger called "enormously Christian, in the Puritan, Calvinist New England tradition", traced its genealogy back over 200 years. A paternal ancestor, Karl Ludwig Seeger, a physician from Württemberg, Germany, had emigrated to America in revolutionary times and married into an old New England family in the 1780s. Pete's father, the Harvard-trained composer and musicologist Charles Louis Seeger, Jr., established the first musicology curriculum in the U.S. at the University of California in 1913; helped found the American Musicological Society; and was a key founder of the academic discipline of ethnomusicology. Pete's mother, Constance de Clyver Edson, raised in Tunisia and trained at the Paris Conservatory of Music, was a concert violinist and later a teacher at the Juilliard School.

In 1912 Charles Seeger was hired to establish the music department at the University of California, Berkeley, but was forced to resign in 1918 because of his outspoken Pacifism during World War I. Charles and Constance moved back east, making Charles' parents' estate in Patterson, New York, northeast of New York City, their base of operations. When baby Pete was eighteen months old, they set out with him and his two older brothers in a home-made trailer, on a quixotic mission to bring musical uplift to the working people in the American South.

On their return, Constance taught violin and Charles composition at the New York Institute of Musical Art (later Juilliard), whose president, family friend Frank Damrosch, was Constance's adoptive "uncle". Charles also taught part-time at the New School for Social Research. Career and money tensions led to quarrels and reconciliations, but when Charles discovered Constance had opened a secret bank account in her own name, they separated, and Charles took custody of their three sons.

Beginning in 1936, Charles held various administrative positions in the federal government's Farm Resettlement program, the WPA's Federal Music Project (1938–1940), and the wartime Pan American Union. After World War II, he taught ethnomusicology at the University of California and Yale University.

Charles and Constance Seeger divorced when Pete Seeger was seven, and in 1932 Charles married his composition student and assistant, Ruth Crawford Seeger, now considered by many to be one of the most important modernist composers of the 20th century.

Deeply interested in folk music, Ruth had contributed musical arrangements to Carl Sandburg's extremely influential folk song anthology the American Songbag (1927) and later created significant original settings to eight of Sandburg's poems.

Pete's eldest brother, Charles Seeger III, was a radio astronomer, and his next older brother, John Seeger, taught in the 1950s at the Dalton School in Manhattan and was the principal from 1960 to 1976 at Fieldston Lower School in the Bronx.

Pete's uncle, Alan Seeger, a noted poet ("I Have a Rendezvous with Death"), had been one of the first American soldiers to be killed in the First World War. All four of Pete's half siblings from his father's second marriage – Margaret (Peggy), Mike, Barbara, and Penelope (Penny) – became folk singers. Peggy Seeger, a well-known performer in her own right, was married for many years to British folk singer and activist Ewan MacColl. Mike Seeger was a founder of the New Lost City Ramblers, one of whose members, John Cohen, married Pete's half-sister Penny (herself a talented singer who died young); Barbara Seeger joined her siblings in recording folks songs for children. In 1935, Pete attended Camp Rising Sun, an international leadership camp held every summer in upstate New York that influenced his life's work.

He still visits, most recently in 2012.

In 1943, Pete married Toshi-Aline Ōta, whom he credited with being the support that helped make the rest of his life possible. The couple remained married until Toshi's death in July 2013.

Their first child, Peter Ōta Seeger, was born in 1944 and died at six months while Pete was deployed overseas. Pete never saw him.

They went on to have three more children: Daniel (an accomplished photographer and filmmaker); Mika (a potter and muralist); and Tinya Seeger (a potter) – and grandchildren Tao (a musician), Cassie (an artist), Kitama Cahill-Jackson (a filmmaker), Moraya (a graduate student married to the NFL player Chris DeGeare), Penny, and Isabelle. Tao is a folk musician in his own right, singing and playing guitar, banjo and harmonica with the Mammals. Kitama Jackson is a documentary filmmaker who was associate producer of the PBS documentary Pete Seeger: The Power of Song.

When asked about his religious or spiritual views, Seeger replied: "I feel most spiritual when I’m out in the woods. I feel part of nature. Or looking up at the stars. [I used to say] I was an atheist. Now I say, it’s all according to your definition of God. According to my definition of God, I’m not an atheist. Because I think God is everything. Whenever I open my eyes I’m looking at God. Whenever I’m listening to something I’m listening to God.".

He is a member of a Unitarian Universalist Church in New York.

Seeger lived in Beacon, New York. He remained engaged politically and maintained an active lifestyle in the Hudson Valley Region of New York throughout his life. He and Toshi purchased their land in 1949 and lived there first in a trailer, then in a log cabin they built themselves.

Toshi Seeger died on July 9, 2013.

Pete Seeger died in New York City on January 27, 2014, of natural causes.[19]