Marais's body of work was extensive, including vocal pieces, instrumental works, and operettas. Below is a selected list based on the
South African Music Encyclopaedia:
A. Vocal works Published Songs (by R. Müller and later by Boosey & Hawkes): •
Four Afrikaans Songs (1928): "Wees sterk my siel" (J.F.E. Celliers), "Slaapdeuntjie" (J.R.L. van Bruggen), "Viermaal gesien" (Totius), and "Amors konfetti" (Jan Celliers). •
Heimwee (1930) (J.R.L. van Bruggen). •
Die roos en ander Afrikaanse liedere (1930): Includes "Die roos" (A.G. Visser), "Dis al" (J.F.E. Celliers), "As saans" (A.D. Keet), and others. •
Vyf kunsliedere (1932): Features "Voor jou en mij" (A. van Scheltema), "Geboorte van die lente" (A.G. Visser), "Malie die slaaf se lied" (Leipoldt), and "Sluimer beminde" (Dirk Mostert). •
Bosveld-toe en twee ander liedere (1934): "Bosveld-toe" (C.F. Visser), "Gee my!" (J.R.L. van Bruggen), and "Nuwe somer" (Eitemal). •
Kom dans Klaradyn (1936) (C.F. Visser). •
Ses kunsliedere (1938): Includes "Moder" (A.D. Keet) and "Bosveldhuisie" (Ben Dreyer). •
Lida en die liedjieskrywer (operetta, 4 acts, 1961, libretto: Joan Retief). Unpublished wongs: •
Daybreak (Longfellow) (1919). •
Die blomtuin (operetta, libretto: S.J.M. Osborne, 1937). • Various school songs, including "Ermelo School Song" (J.J. Spruyt) (1938) and "Potchefstroom School Song" (1949).
B. Instrumental works •
Mymeringe for piano (1916). •
Aubade for organ (1930). •
My eerste musiekboek (1946), dedicated to his wife, Edith Johanna Rex. '
C. Songs included in the FAK Volksangbundel''''' • "Amors konfetti" (included in the 1st and 3rd editions). • "As saans" (included in the 3rd edition). • "Bosveldhuisie" (included in the 1st and 3rd editions). • "Heimwee" (included in the 3rd edition). • "Kom dans Klaradyn" (included in all three editions). • "Die roos" (included in the 1st and 3rd editions). • "Slaapdeuntjie" (included in the 1st edition). ==Personal life==