He sang a total of 81 performances in ten roles there, last appearing there on October 26, 1996, as Sparafucile in "Rigoletto". During the course of his career, he also performed at Moscow's Bolshoi Theatre, the Vienna State Opera, Covent Garden, and Paris Opéra. In the late 1970s Ghiaurov sang the title role in the first complete stereo recording of Massenet's opera "Don Quichotte". He was recorded frequently, and his discography includes complete recordings of many of his great stage roles, including Don Giovanni, Don Basilio, Ramfis, Colline, Banco, Gounod's and Boito's Mephistos and Boris Godunov, among many others. In October 2000, at the age of 71, he gave an acclaimed performance at the 1st Herbert von Karajan Memorial concert under the baton of James Allen Gähres in Ulm, where he sang opera arias and duets by Cilea, Tchaikovsky and Verdi, together with Mirella Freni. In Ghiaurov's obituary in "Opera News", Martin Bernheimer remarked: "He commanded a remarkable vocal instrument, strikingly generous in size, warm in timbre, dark in color. He rolled out the resonant tone at his command with generosity, and with special ease at the burnished top." Ghiaurov Peak on Livingston Island in the South Shetland Islands, Antarctica is named after Nicolai Ghiaurov.