The Siberian singer died after surgery for a brain hemorrhage July 25, friend Sean Quirk said.
Ondar brought traditional Tuvan throat singing to the Western world, where the technique was relatively unheard of until the 1980s, the Los Angeles Times reported Saturday.
"More than any other Tuvan, Ondar has implanted throat-singing in the sphere of American popular culture," said Dartmouth College ethnomusicologist Theodore Levin.
"People had the bizarre sense that they understood everything Kongar-ol was saying even though he was not singing in English," said Roko Belic, a filmed a documentary about Ondar. "He could communicate in expression and song and touch people in a very deep way."