sentences:  Some of the last performances immediately before closure of the theatre's building were "Swan Lake" on 30 September with the Ballet Estable del Teatro Colón and the Buenos Aires Philharmonic ("Orquesta Filarmónica de Buenos Aires").and, on 28 October, the opera "Boris Godunov" was given featuring Orquesta Estable del Teatro Colón and the house chorus.The theatre's final performance before its closure for refurbishment works in 2005 was a concert on 1 November starring folklore singer Mercedes Sosa in performance with the Argentine National Symphony Orchestra, conducted by Pedro Ignacio Calderón.