Montag is an opera for 21 solo performers (14 voices, 6 instrumentalists, and 1 actor) plus mimes, a mixed choir, children's choir, and "modern orchestra". It was composed between 1984 and 1988. Monday is Eve's day. Its exoteric colour is bright green; its esoteric colours are opal and silver (Stockhausen 1989b, 200).

Librettist Karlheinz Stockhausen
Date of composition 1988 (1984-1988)
Premiered 1988, May 7th (Teatro alla Scala) in Milan, Metropolitan City of Milan, Italy
Type Opera
Catalogue Nr. 55-59
Instruments 3x Voice (Soprano) - Eve
Voice (Bass) - Lucifer
Voice (Bass) - Luzipolyp
3x Voice (Tenor) - Three Sailors
Basset Horn - Coeur de Basset
Piano - Budgerigar
7x Voice (Soprano) - Monday, Tuesday, Wednesday, Thursday, Friday, Saturday and Sunday boy
Basset Horn - ; Bassettinen
Flute - Pied Piper
Chorus/Choir - Mixed Chorus ; Invisible Choir
Children's chorus - Animal-Children, Heinzelmännchen (act 1), Girls' Choir (act 2), Children (act 3)
Chorus/Choir - Men and Women
Autotranslations beta Karlheinz Stockhausen: Montag aus Licht, Nr. 55-59
Karlheinz Stockhausen: Montag aus Licht, Nr. 55-59
Karlheinz Stockhausen: Montag aus Licht, Nr. 55-59