Franco Corelli, Luciano Pavarotti, Plácido Domingo, José Carreras and, more recently, Roberto Alagna and Jonas Kaufmann are among the tenors to have included Core 'ngrato in their repertories.
Roberto Cavalli | Roberto Rossellini | Roberto Carlos | Roberto Durán | Roberto Clemente | Roberto Bolaño | Alagna Valsesia | Roberto Faenza | Roberto Calvi | Roberto Matta | Roberto Alagna | Roberto Carlos (singer) | Roberto Mancini | Roberto Carlos (footballer) | Roberto Baggio | Roberto Moreno | Roberto Longhi | Roberto Formigoni | Roberto Di Matteo | Roberto De Vicenzo | Roberto D'Alimonte | Roberto Benigni | :it:Roberto D'Alimonte | Agustín Roberto Radrizzani | Roberto Valera | Roberto Stagno | Roberto Salmeron | Roberto Rodríguez | Roberto Martínez | Roberto Díaz Herrera |
This tenure gave him the opportunity to work with conductors such as Friedemann Layer, Maurizio Arena, Richard Bradshaw, Woldemar Nelsson and Donato Renzetti, and singers such as Roberto Alagna, José van Dam, Jean-Philippe Lafont, Leontina Vaduva, Nuccia Focile, Françoise Pollet, and Catherine Malfitano.
Apart from the "Christmas in Vienna" concerts, he also recorded the Love Songs CD with José Carreras, CD and DVD of Pagliacci with Roberto Alagna and Svetla Vassileva, CD with Ramón Vargas & friends.