sentences:  Edelstein both conducted the ENS and played the piano alongside, Mariano Cura (Keyboards / Technical Head), Nicolás Varchausky (Electric Guitar), Diego Romero Mascaró (Drums & Percussion), Mario Castelli (Piano), Jerónimo Carmona (Bass & Double Bass) and Richard Arce (Electric Guitar).El Hecho [The Fact] (1998), due to its popularity and controversy, was performed over fifty times, which is unusual for a new opera.The work was made in memory of Juan Carlos Paz, inspired by Paz' graphic design, Seis eventos [Six Events] which was Paz' last work but which was never musically realised it was the first work to pay homage to the famous Argentine composer and in it Edelstein also makes reference to his thwarted attempt to study with Paz.