|Year|Cast (Nabucco, Abigaille, Zaccaria, Ismaele, Fenena)|Conductor, Opera House and Orchestra|Label|
|---|---|---|---|
|1951|Paolo Silveri, Caterina Mancini, Antonio Cassinelli, Mario Binci, Gabriella Gatti|Fernando Previtali, Orchestra Sinfonica e Coro di Roma della RAI|Audio CD: Warner Fonit 8573 82646-2|
|1965|Tito Gobbi, Elena Souliotis, Carlo Cava, Bruno Prevedi, Dora Caral|Lamberto Gardelli, Vienna State Opera Orchestra and Chorus|Audio CD: Decca Cat: 417 407-2|
|1977–78|Matteo Manuguerra, Renata Scotto, Nicolai Ghiaurov, Veriano Luchetti, Elena Obraztsova|Riccardo Muti, Philharmonia Orchestra and the Ambrosian Opera Chorus|Audio CD: EMI Records Cat: 747 488-2|
|1982|Piero Cappuccilli, Ghena Dimitrova, Evgeny Nesterenko, Plácido Domingo, Lucia Valentini Terrani|Giuseppe Sinopoli, Deutsche Oper Berlin|Audio CD: DG Cat: DG 410 512-2|
|1987|Renato Bruson, Ghena Dimitrova, Paata Burchuladze, Bruno Beccaria, Raquel Pierotti|Riccardo Muti, La Scala, Milan Orchestra and Chorus|DVD: Warner Cat: 5050467-0944-2-0|
|2002|Juan Pons, Maria Guleghina, Samuel Ramey, Gwyn Hughes Jones, Wendy White|James Levine, Metropolitan Opera|DVD: DG, live recording Cat: B0006O9M6S|
|2004|Alberto Gazzale, Susan Neves, Orlin Anastassov, Yasuharu Nakajiima, Annamaria Popescu|Riccardo Frizza, Teatro Carlo Felice Orchestra and Chorus|DVD: Dynamic, live recording Cat: 33465|
|2004|Renato Bruson, Maurizio Frusoni, Lauren Flanigan, Carlo Colombara, Monica Bacelli|Paolo Carignani, Teatro San Carlo Naples Orchestra and Chorus|DVD: Brilliant Classics, live recording Cat: 92270|
|2007|Leo Nucci, Maria Guleghina, Carlo Colombara, Fabio Sartori, Nino Surguladze,|Daniel Oren, Arena di Verona Orchestra and Chorus|DVD: Decca, live recording Cat: DDD 0440 074 3245 7 DH|

Question: how many recordings of nabucco have been made?
Answer: 9