sentences:  The conductor Claudio Abbado usually presents one opera every season and the 2007 schedule  shows four operas being staged between February and April, along with dance and theatre and other events of various kinds.Between January and April 2008 the four operas performed were "Motezuma" by Vivaldi, "Maria de Buenos Aires" by Astor Piazolla, "Tosca" by Puccini and "Lucia di Lammermoor" by Donizetti.The theatre's 2013/14 season shows performances of four operas.