Giannini was but a name in reference books to me until a couple of years ago when Naxos released the coupling of his Fourth Symphony and the Piano Concerto. Since then I have been able to hear a number of his other compositions through downloads from this site :) Walter Simmons includes Giannini as one of six American composers discussed in his definitive "Voices in the Wilderness: Six American Neo-Romantic Composers"(Scarecrow Press, 2004). The others are Samuel Barber, Paul Creston, Nicolas Flagello, Howard Hanson, and, a trifle controversially, Ernest Bloch. Simmons points out however that whereas Hanson, for example, was quite clearly a neo-romantic, Giannini, at least during the first half of his career, was an out-and-out old-fashioned romantic :)
Simmons also states that a complete catalogue of Giannini's music is impossible to compile because so much was unpublished, undated or lost. What follows therefore cannot be considered 'complete'.
VITTORIO GIANNINI: A CATALOGUE OF THE ORCHESTRAL AND CHORAL MUSIC
1920: Stabat Mater for soprano, contralto, tenor, bass, chorus and orchestra
1931: Suite for orchestra
1933: Cantata "La Primavera" for soloists, chorus and orchestra
1934: Piano Concerto: 41 minutes + (Naxos cd)
1935: Symphony "In Memoriam Theodore Rossevelt": 37 minutes *
1937: Organ Concerto
Triptych for soprano, choir and strings
IBM Symphony: 11 minutes *
Requiem Mass for soprano, contralto, tenor, bass, choir and orchestra
1939: Double Piano Concerto
1944: Violin Concerto: 15 minutes
1946: Trumpet Concerto
Concerto Grosso for string orchestra: 15 minutes + (Albany cd)
1948: "Frescobaldiana" for orchestra
1950: Symphony No.1 "Sinfonia"
1951: "A Canticle of Christmas" for baritone, chorus and orchestra: 23 minutes
1953: Divertimento No.1 for orchestra: 15 minutes *
1955: Symphony No.2: 21 minutes *
Prelude and Fugue for string orchestra: 10 minutes + (Albany cd)
1956: "Canticle of the Martyrs" for baritone, chorus and orchestra: 15 minutes
1958: Symphony No.3 for symphonic band: 23 minutes + (Mercury, Reference and Naxos cds)
Suite "Love's Labour's Lost" for chamber orchestra
Preludium and Allegro for symphonic band: 7 minutes + (Naxos cd)
1959: Symphony No.4: 23 minutes + (Naxos cd)
1960: "The Medead" for soprano and orchestra
1961: Divertimento No.2 for orchestra
1962: "Antigone" for soprano and orchestra
1963: Psalm CXXX for Double-Bass or Cello and Orchestra: 17 minutes + (Mmc cd)
Fantasia for Band
1964: Divertimento No.3 for orchestra
Dedication Overture for band: 7 minutes + (Naxos cd)
Variations and Fugue for symphonic band: 14 minutes + (Naxos cd)
Symphony No.5: 31 minutes *