Pete Seeger died on Monday...

...and according to his obit in the Times (my emphasis):

Mr. Seeger was a prime mover in the folk revival that transformed popular music in the 1950s. As a member of the Weavers, he sang hits including Lead Belly’s “Goodnight, Irene” — which reached No. 1 — and “If I Had a Hammer,” which he wrote with the group’s Lee Hays. Another of Mr. Seeger’s songs, “Where Have All the Flowers Gone?,” became an antiwar standard. And in 1965, the Byrds had a No. 1 hit with a folk-rock version of “Turn! Turn! Turn!,” Mr. Seeger’s setting of a passage from the Book of Ecclesiastes.

Here's one of my favorite versions of “If I Had a Hammer,” by Peter, Paul and Mary.