From "Little Organ Book": Pasticcio

A small pastry.? :-)
In music, a pasticcio or pastiche is an opera or other musical work made up of works by different composers who may or may not have been working...

Langlais' music is written in a highly individual eclectic style, venturing well beyond what might be expected of mid-twentieth-century French music, with rich and complex harmonies and overlapping modes, sometimes more tonal than his contemporary, friend and countryman Olivier Messiaen, sometimes related to his two predecessors at Sainte-Clotilde, Franck and Tournemire, but sometimes also employing serial techniques and often exhibiting an earthy, Celtic folkiness which owes not a little to Bartok:

His best-known works include his four-part masses, Messe solennelle and Missa Salve Regina, his Missa in simplicitate for unison voice and organ, and his many organ compositions,