In 1927 he moved to Paris, where the music of Maurice Ravel and Igor Stravinsky made a deep impression on him. Here he was in close contact with the group of composers known as Les Six, which included Darius Milhaud, Arthur Honegger, and Francis Poulenc. He married Lien de Vries in Amsterdam in January 1933. At the end of 1936, Smit moved to Brussels, where he stayed for a year. In late 1937, he returned to Amsterdam, where he completed his last work, the sonata for flute and piano, on February 12, 1943. On April 27, 1943 he was deported to Sobibor, where he was killed three days later.
After his death there was for a time little interest in his music, but since the late 1980s, his work has been performed regularly. A 4-CD box set containing his complete works, Kamermuziek en Orkestwerken (NM 93003) has been issued.
Compositions
Sonata for Flute and Piano (1943); orchestrated in 1989 by Willem Strietman
String Quartet (1939–1943)
Divertimento for Piano 4-Hands (1940); orchestrated in 2008 by Andries van Rossem
Concerto for Viola and String Orchestra (1940)
De bruid (The Fiancée) for Female Chorus (1939); words by Jan Prins
Suite for Oboe and Cello (1938)
Trio for Clarinet, Viola and Piano (1938)
Kleine Prelude van Ravel for Alto and Piano (1938); poem by Martinus Nijhoff
La Mort (Death) for Soprano, Alto and Piano (1938); words by Charles Baudelaire
Concerto for Piano and Wind Orchestra (1937)
Concertino for Cello and Orchestra (1937)
Symphonie in C (1936)
Sextet for Flute, Oboe, Clarinet, Bassoon, Horn and Piano (1933)
Concertino for Harp and Orchestra (1933)
Deux hommages for Piano (1928–1930)
Schemselnihar, Ballet for orchestra (1929)
Quintet for Flute, Violin, Viola, Cello and Harp (1928)
Trio for Flute, Viola and Harp (1926)
Suite for Piano (1926); Forlane et Rondeau, movements freely orchestrated in 1958 by Godfried Devreese
Silhouetten for Orchestra (1925)
Voorspel tot Teirlincks "De vertraagde film" (Overture to Teirlinck's "De Vertraagde Film") for Orchestra (1923)
Twintig eenvoudige oefeningen (20 Simple Exercises) for Piano
Twaalf stukken voor 4 handen (12 Pieces) for Piano 4-Hands