Chanson à bouche fermée (Song for closed mouth), JA 039, is a composition for unaccompanied four-part choir by Jehan Alain.

Jehan Alain composed Chanson à bouche fermée in 1933 for a four-part choir (SATB), to be sung without text and with closed mouth, in the Chant à bouche fermée  [fr] vocal technique.

The music begins softly, is carefully marked for crescendo and decrescendo and ends perdendoso, fading away.

The music is repeated, and then seems to begin another repetition, creating a sense of a "perpetual movement".

[1] Chanson à bouche fermée was included in a concert program of the Maîtrise de Radio France and Maîtrise de Radio France - Maîtrise Notre-Dame de Paris at Notre-Dame de Paris on 17 November 2017, in a program of French choral music around 1900, including Poulenc's Litanies à la Vierge noire and Duruflé's Quatre Motets sur des thèmes grégoriens.