Concepts:
terms for sound sources: recorded sound, synthetic or synthesized sound; analog and digtal techniques
genre names: musique Concrète; Elektronischemusik; computer music
modes of production: classical studios; computers; live electronic music; electronic musical instruments

Music on reserve:
Pierre Schaeffer, Etude Pathétique (1949; 4:01)
John Cage, Williams Mix (1952; 4:13)
Karlheinz Stockhausen, Study II (1954; 3:01)
Louis and Bebe Barron: Overture to score for Forbidden Planet (1956; 2:50)
James Tenney, Collage #1 (1963; 3:22)
Laurie Anderson, O Superman (1979; 8:25)
John Chowning, Phōnē (1981; 12:33)
Rand Steiger, 13 loops (1988; 16:18)

Reading:

Grove Dictionary entry on "electroacoustic music"

Note these possible sources of confusion: what Grove calls "electroacoustic music" is called "electronic music" in the US. Their term "electronic" roughly means "of purely electronic origin" (as opposed to derived from recordings).
It's strange that Grove doesn't mention IRCAM (Paris, France), a world-famous studio where live digital musical instruments came into their own.