American folk icon Pete Seeger has died.

Seeger's grandson says he died of natural causes at New York Presbyterian Hospital.

Seeger gained fame as a member of The Weavers, the quartet formed in 1948 and had hits such as "Goodnight Irene.'' 

Seeger was best known as a champion of folk music -- who popularized songs like "This Land Is Your Land" and "We Shall Overcome," and wrote classics like "If I Had a Hammer" and "Turn, Turn, Turn."

He continued performing and recording for six decades and was still an activist as recently as October 2011 when he marched in New York City as part of the Occupy Wall Street protests.

He was onstage in January 2009 for a gala Washington concert two days before Barack Obama was inaugurated. 

 

Seeger was 94.