"The Group" is Gruppo di Improvvisazione Nuova Consonanza, who we know is a band that Ennio Morricone is associated with. Totally experimental, and more John Cage-like than what we think of with respect to Morricone's more mainstream movie soundtrack work. "The Feed-Back" is Gruppo di Improvvisazione with an incredible beat. The one consistent instrument throughout the recording of this album are the drums. It's very Can/Neu like, that it's a beat that doesn't give up.
The music is free-form, but the drums keep everything grounded to a groove. An adventuresome DJ can play this album in a nightclub, and I don't think there will be that many people leaving the dance floor. There are only a handful of recordings by or with Morricone that has nothing to do with film scoring. So it's interesting avenue or opportunity for him to do what he wants to without the restrictions of a producer. Which comes to mind, does a filmmaker dare tell him what to do?
To give full credit to the band, it consisted of Walter Branchi, Renzo Restuccia, Bruno Battisi D'Amario, Egisto Macchi, Mario Bertoncini, John Heineman, and of course, Morricone.