What it used to be called:
Music. The electric guitar was developed in the 1920s (when it was first adopted by jazz musicians), and popularized in the late 1940s by the legendary Fender Company.
As a result, its predecessor was dubbed the acoustic guitar.
The two instruments once represented more of a culture clash than they do now. For example, when Bob Dylan famously plugged in his electric guitar at the 1965 Newport Folk Festival, he alarmed some folk music fans and, as Rolling Stone magazine put it, "unveiled his rock & roll heart."
An early use:
"[Garland Jeffrey's] new album, "American Boy and Girl," where he wrote all the songs, sings, and plays some acoustic guitar and percussion, has several songs about these 'urban throwaways.'" Mary Campbell, Associated Press, Jan. 1960