1940s; earliest use found in Gustave Reese (1899–1977). From post-classical Latin musica plana from classical Latin mūsica + plāna, feminine of plānus flat.
Definition of musica plana in US English:
musica plana
nounˌmjuːzɪkə ˈplɑːnə
Early Music
Plainchant.
Origin
1940s; earliest use found in Gustave Reese (1899–1977). From post-classical Latin musica plana from classical Latin mūsica + plāna, feminine of plānus flat.