Jesse Colin Young died on Sunday from a heart attack at his home in Aiken, South Carolina.
His spokesman says, "As the frontman of The Youngbloods, he immortalized the ideals of the Woodstock generation with "Get Together," an international hit that called for peace and brotherhood during the turbulent 1960s.
During the decades that followed, Young expanded both his audience and his artistic range, releasing a string of solo albums that mixed socially conscious lyrics with top-tier guitar skills and gorgeous vocals.
"An acclaimed songwriter, singer, instrumentalist, producer, label owner, podcast host and longtime social/environmental activist, he has established a permanent place in America's musical landscape -- while continuing to make modern music that's every bit as vital as his work during the counterculture era."
Young, born Perry Miller on November 22nd, 1941 in Queens, New York, was 83.
He leaves behind his second wife and manager Connie, and four children -- two from each marriage.