Via Openculture with a useful introductory paragraph:

"Spanning the years 1937–2001, the collection should especially appeal to those with an avant-garde or musicological bent. In fact, the original uploader of this archive of experimental sound, Caio Barros, put these tracks online in 2009 while a student of composition at Brazil’s State University of São Paulo. Barros’ “initiative,” as he writes at Ubuweb, “became some sort of legend” among musicophiles in the know."

As Ubuweb notes:

"It's a clearly flawed selection: there's few women and almost no one working outside of the Western tradition (where are the Japanese? Chinese? etc.). However, as an effort, it's admirable and contains a ton of great stuff."

Openculture has a starting point for such an expansion, however: Hear Seven Hours of Women Making Electronic Music (1938–2014) in which "musician, DJ, and 'escaped housewife/schoolteacher' Barbara Golden devote[s] two episodes of her KPFA radio program “Crack o’ Dawn” to women in electronic music, once in 2010 and again in 2013."