Pauline Oliveros is one of the true pioneers of electronic music. Still going strong at 80 she have produced quite a massive catalogue during the years. Especially interesting is her work with electronics and tape music in the 60's and 70's. If you want to dip your toes and check out her output the Sub Rosa collection "Four Electronic Pieces 1959-1966" (for those so inclined it's also available on iTunes and Spotify) is a good starting point.
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If you want to dig deeper there's also the massive 12 CD box set released by Important Records recently. Quite unusually they have produced a trailer for the box set. It's a rather proper and dignified affair.
Oliveros is also a a figurehead of improvisational music, and the following clip focuses on that aspect, but also contains a good basic overview of her development as an artist.