Astor Piazzola (bandoneon), Gerry Mulligan (baritone sax), Angel Pacho Gatti (keyboards), Tulio de Piscopo (drums, percussion), Giuseppe Prestipino (bass guitar), Filippo Dacca and Bruno de Filippi (guitar), Umberto Michelangelo (violin), Renato Riccio (viola), Ennio Miori (cello)recording September - October 1974, Mondial Recording Studios, Milan