"It was the years of experimentation, of dissonances. That musical experiment in the woods of Darmstadt, conceived and 'directed' by Morricone, pushed one of those eight friends «to dare new things: to make music as composers, without writing it down». It was Franco Evangelisti who founded the Associazione Nuova Consonanza and the eponymous Group (Ginc) which allowed for the practical application of the first Italian theories on improvisation. Morricone joined the ensemble in 1966, the year of the 'Ginc's' first album. He played the trumpet: «It was a very serious thing; we put so much love and commitment into the research. We would do months of improvisation, then we would record ourselves and every evening we listened to our work to improve it, experimenting with new paths".
Morricone remembers Petrassi: "Do not neglect 'absolute music'"
http://www.romasette.it/morricone-ricorda-petrassi-mi-rimprovero-di-trascurare-la-musica-assoluta/
Absolute music? I have always harbored strong doubts in this regard