 She was asked that same year to organize the music section of the Folklore Research Service established in Venezuela, and she continued her research on folk music there.In 1966 she was awarded a Guggenheim Fellowship to record native melodies in Mexico, Colombia, Ecuador and Central America.Aretz-Thiele founded the American Institute of Ethnomusicology and Folklore (INIDEF) in Venezuela and chaired the institution from 1990 and 1995.