noun, masculine/sɔl.fɛʒ/plural: solfèges
solfège is masculine in French.
the art of singing using the sol-fa system; sol-fa, solfège; music theory, the training and courses that come with it as well as one's knowledge of it
“Prendre des cours de solfège.” — To partake in music theory classes.
Borrowed from Italian solfeggio.