This music was from a program dedied to Raymond Gallois-Montbrun, so perhaps this limits a Little the scope of the mystery.

I am sorry for the mistake, but the link is correct, the intro of the French Radio is for the Trois Danses, so I have no more information about this work. I have removed it.

Alejandro García Caturla (Remedios 1906 - 1940)

Bembe (1929)
http://www.mediafire.com/download/qqjxqq25ls0z4gi
Orquesta Sinfónica Nacional de Cuba, Manuel Duchesne Cuzán conducting

Broadcast by Catalunya Musica from a Radio La Habana recording

Joaquín Turina (Sevilla 1882 - 1949)

This Sea Symphony was composed between 1945 and 1948 but left unfinished at the composer's death in 1949 (only piano score).
The work was orchestrated in 1982 by Manuel Castillo (1930-2005) for a concert to celebrate the composer's centenary. This is the version uploaded here.

Sinfonía del mar (Sea Symphony)
http://www.mediafire.com/?qyo9nsm2fgn23ic
Orquesta Nacional de España, Benito Lauret conducts.

From the 1982 concert broadcast by RNE Radio Clásica at a later date.

Joaquín Turina Sinfonía del mar (Symphony of the Sea), unfortunately unfinished.

Vicente Ascone (Siderno, Calabria 1897 - 1979)

Italian-born uruguayan composer

Tres estampas campesinas (Three rural sketches) (Date unknown)
http://www.mediafire.com/?4trjne5673t49mq
Orquesta sinfónica del SODRE, Juan Protasi conducts

Broadcast from RNE Radio Clásica from the eighties (so old cassette...)

Rodolfo Arizaga (Buenos Aires 1926 - 1985)

Música para Cristóbal Colón, Symphonic Poem (1966)
http://www.mediafire.com/download.php?b79mp2mbx3f9z2c
Orquesta Filarmónica de Buenos Aires, Pedro Calderón conducts

Luis Milici (Rosario 1910 - 1998)

Impresiones norteñas, suite (date unknown)
http://www.mediafire.com/download.php?em6v8eu4761tqjo
Orquesta de cámara municipal de Rosario

Edgar Spinassi (Rosario 1922 - 1983)

Rapsodia sobre un tema de tango (date unknown)
http://www.mediafire.com/download.php?k9j4xbl92xkqe3g
Alicia Correa (piano)
Orquesta de cámara municipal de Rosario

Channel dedied to Italian composer Vieri Tosatti (1920-1999) incudes two complete operas, viola concerto,..and the famous 'Partita a pugni'
http://youtu.be/fvP9CH6bPeE

Alexander Tansman - Sabbataï Zevi

http://www.mediafire.com/?r56725ldw50xtgq

Fresque lyrique en un prologue et 4 actes d'après la pièce de Nathan Bistritzky traduite en français par I. Ezrachi Krischevski.

Jacques Doucet, basse : Sabbatai
Geneviève Moizan, soprano : Sarah
Jacqueline Maréchal, soprano : l'Adolescent
Paul Derenne, ténor : Moshé
Jean Giraudeau, ténor : Samuel
Louis Amade, ténor : le Sultan
Georges Abdoun, ténor : le Vizir
Jean Mollien, basse : Nehemie
Chœurs et Orch. National de la RTF
Direction : Charles Bruck

Recording of the world premiere March 3 1961 at the Théâtre des Champs-Elysées

I have recordings of the operas 'Sabbataï Zevi, le faux messie' (1953) and 'Le serment' (1954) both recorded from France Musique. If you are insterested I can upload them, as far as I know they are not available on CD.

Salvador Brotons (Barcelona 1959)

Catalan composer, conductor and flutist, from 1987 to 1997 in the USA. His music is not particularly dissonant.

Symphony n.2 "Resplandor" (Brilliance) (1983)
Orquestra Ciutat de Barcelona, the composer conducts
http://www.mediafire.com/?9kq1i53bpfzbz8o

Symphony n.3 (1992)
Orquesta Clásica de Madrid, Odon Alonso conducts
http://www.mediafire.com/?wnu37yuibd837ds

Concert broadcasts by Catalunya Musica and Radio Clasica respectively

Volodymir Zubitskiy (Ukraine 1953)
Folk-symphony "Chumak songs" "Dumka"
http://youtu.be/qGcPCEHbzwI

Valentin Bibik (Ukraine 1940 - 2003)
Farewell Symphony-Poem on verses of A.Pushkin for Choir and Chamber orchestra http://youtu.be/wVY18uUlb5I
Also symphony n.5, 10, concertos...etc in the same channel

Sorry, I forgot to check Obscure Composers section.... My mistake.

Emil Tabakov (Bulgaria 1947) symphonies n.5,6,7,8
http://youtu.be/9axdaWXJexQ