Langlais in the 1970s explored several compositional areas including the use of two organs and/or two organists at one organ. Marie-Louise Langlais and Sylvie Mallet play these works, and some for solo organ, on the much admired organs of the Hofkirche in Lucerne, Switzerland.
Esquisses gothiques Nos. 2 & 3 for two organs;
Esquisse romane No. 3 for two organs;
Oh qui viens, Seigneur Jésus;
La Cinquième trompette;
Il était, Il est et Il vient;
Double Fantaisie for 2 organists;
2nd and 3rd Fantaisies pour 2 organistes;