Back in the day, i.e. in the infancy of radio and up to the 1960s, music was divided (in many Eurpean countries) into two main categories:
1. Art music - which included all types of "pre-20th c" classical music, opera, sacred and modern serious music (serialism, electronica etc.), and from the 70s onwards could have included a fair bit of "seriously composed" progressive music.
AND
2. Entertainment music - mostly for dancing to, and listening to at home, which was basically everything else, from folk to easy listening to jazz to pop.
Part of the problem (then as now) was that many people were still using the term classical music to refer to all art music.
In correct terminology classical is also a period of classical music, but apart from that even the catch all term "classical music" still doesn't cover everything under art music and is therefore a poor term to use.
Art music as a term can cover everything from early 20th c modernism, atonal and serialism to mid-century experimental, electronica, avantgarde and modern sacred to late-century found music, post-music, installation (event) compositions, electronic soundscapes and electro-drone and synth compositions. In other words everything from Messiaen to Stockhausen to Cage to Reilly to Reich to Oldfield to Tangerine Dream to Jarre and so on.
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