This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Porte thorique de lignes.svg fr porte thorique de lignes schma extrait de la Thorie de la musique de Danhauser Danhauser Thorie de la musique djvu creator Adolphe Danhauser other versions inkscape ValidSVG PDold Adolphe Danhauser Music Scales Staves
Page 2023 Free-images.com. All images are Public Domain