Within
art music he is considered responsible for the introduction of modern classical to Spain, and the development of chance through his concept of flexible music, based on free interpretation within limits set by the composer. Key among his works are the three symphonies (1974, 1980, 1990), the
Rondo for Orchestra (1992),
Clamores y Secuencias (1993) and
Song for Euskera (1995), a tribute to his native language. He also scored
Adolfo Marsillach's 1989 theatre production of
la Celestina. Notable among his popular works are the 1982 arrangement of the
Athletic Bilbao FC anthem
Athleticen ereserkia, and numerous works for television series:
El pícaro (1974),
La clave (1976) y
Verano azul (1981). Notable among the 82 film soundtracks he composed are
Mambrú has gone to war (1986),
Wait for me in heaven (1988) and the Goya-winning
Pasodoble (1989). The works indicated in this list do not include his compositions for several plays, films and TV shows. He regarded these "functional" compositions as distinct from his "real" catalogue of vocal and instrumental works. • 1955: Trío-Sonatina (for
oboe,
clarinet and
bassoon); Capricho (for clarinet and
piano); Music for
wind quintet. • 1956: Three piano pieces. • 1957: Suite-divertimento (piano and
orchestra); Homenaje a Scarlatti (piano and orchestra);
String Quartet No.1. • 1958: Canción y danza (piano). • 1959: Cuatro piezas infantiles (piano). • 1960: Píccolo Concerto (
violin and string ensemble); Constantes (voice, 3 clarinets and
percussion). • 1961: Superficie número 1 (chamber ensemble); Sinfonetta Progresiva (string ensemble). • 1962: Espacios variados; Superficie número 2 (
violoncello). • 1963: Permutado (violin and
guitar); Superficie número 4; Morfología sonora (piano). • 1964: Mixturas. • 1965: Heterofonías. • 1966: Episodio (
bass); Traza. • 1967: Músicas de cámara. • 1968: Continuo (piano). • 1969: Polifonías. • 1970: Oda für Marisa. • 1971: Relatividades. • 1972: Impulsos; Argia ezta ikusten. • 1974: Sinfonía en do; Negaciones de San Pedro (bass and choir); Presencia (string quartet and piano); Per due. • 1976: Superposiciones variables.; Así; Tiempos (violoncello and piano); Pieza I. • 1977: Achode (clarinet quintet). • 1978: Villanesca; Entrada; Juegos. • 1979: A mi aire; Qué familia; Superficie número 5 (
double bass). • 1980: Variantes combinadas (chamber ensemble); Symphony No.2.; Galatea, Rocinante y Preciosa; Koankinteto; Variantes combinadas. • 1981: Béla Bartók I; Tres piezas. • 1984: Las siete palabras de Cristo en la Cruz. • 1985: Variaciones concertantes (Espacios variados número 2). • 1986: Nostálgico (piano and orchestra). • 1987: Perpétuo, cántico, final (piano). • 1988: El retablillo de Don Cristóbal; Per a Fréderic (trio). • 1989: La Celestina. • 1990: Symphony Nº 3. • 1992: Scherzo. • 2001: Fantasías. ==Selected filmography==