Back in Buenos Aires he founded his Conjunto 9 (a.k.a. "Nonet"), a chamber music formation, which was a realisation of a dream for Piazzolla and for which he composed some of his most sophisticated music. He now put aside his first Quinteto and made several recordings with his new ensemble in Italy. Within a year the Conjunto 9 had run into financial problems and was dissolved and in 1972 he participated in his first concert at the Teatro Colón in Buenos Aires, sharing the bill with other Tango orchestras.