In the field of biology Heterozygous (Hétérozygote) means: a plant whose heredity is mixed. It implies that Hétérozygote, composed between December 1963 and March 1964, is an attempt to engineer a language located both on the musical and on the dramatic plane. You could call this music "Anecdotal Music" for if the organization of events is purely musical, their choice suggests situations justified at two levels: the music and the anecdote. Luc Ferrari explains the piece Petite Symphonie Intuitive Pour Un Paysage De Printemps (1973-1974) in 2002: "This electroacoustic music is part of a series that could be called 'imaginary soundscape'. Unlike 'Presque Rien Ou Le Lever Du Jour Au Bord De La Mer (Almost Nothing Or Daybreak By The Seaside)', where the landscape narrates itself, here a traveller discovers a landscape which he tries to convey as a musical landscape. Brunhild and I were in the Gorges du Tarn area. We chose to take a small path that was going up a rocky mountain for about ten kilometres. After a last turn, a totally unexpected landscape opened before my eyes. It was sunset. Before us, a vast plateau spread open with soft curves up to the horizon, up to the sun. The colours ranged from dry grass yellow to purple, in the distance, with the darkness of a few small groves punctuating the space. The almost bare nature was presenting itself to the eye, free from any obstacle. We could see everything. Later, when I recollected this place and the sensations I had experienced there, I tried to compose a music that could revive this memory. The 'Causse Méjean' is a high plateau, about 1000 m high, in the Massif Central mountain range. It is dotted by scattered farms. A few people bring their flocks of sheep home. I thought about evoking this solitary and hazy human presence by including snippets of conversations I had had with some of the shepherds. Human language is woven into the musical texture; the sound of the voice says more than its actually meaning. Once, a shepherd told me '... I am never bored. I listen to the landscape. Sometimes I play my flute and then I listen to the echo responding...' Thinking of him, I used the flute and its echo in my music."