Question: Marcello Giordan is sometimes confused with what artist that toured with Russian operatic soprano Anna Netrebko in 2009?

Context paragraphs:
Tamara Novichenko: Tamara Dmitrevna Novichenko (Russian: Тамара Дмитриевна Новиченко ) is a Russian soprano singer and Meritorious Artist.  Novichenko is a graduate of Rimsky-Korsakov Leningrad State Conservatory.  As of 1972 she is a professor at the Saint Petersburg Conservatory but only got this title in 1992.  She performs in many Russian cities including: Petrozavodsk, Pskov, and Volgograd and also appears abroad in Stuttgart, Prague, Wroclaw, and Seoul.  Throughout her life as a teacher she had graduated over 50 students including Elena Ustinova, Galina Shoydagbaeva, Elena Mirtova, Marina Shaguch, Anna Netrebko, Tatiana Pavlovskaya, and Irina Matayeva.

Anna Netrebko: Anna Yuryevna Netrebko (Russian: Анна Юрьевна Нетребко , born 18 September 1971) is a Russian operatic soprano.  She now holds dual Russian and Austrian citizenship and currently resides in Vienna, Austria, and in New York City.

Music in Krasnodar Krai: Krasnodar is both a krai and a city within it, in Russia.  Grigoriy Ponomarenko is the best-known composer from Krasnodar, which has also produced the State Cossack Choir, led by laureate of the state prize of Russia, V. G. Zakharchenko.  The world-renowned operatic soprano Anna Netrebko also comes from Krasnodar.

Lyubov Kazarnovskaya: Lyubov Yurievna Kazarnovskaya (Russian: Любо́вь Ю́рьевна Казарно́вская , born 18 July 1956) is a Russian operatic soprano who has sung leading roles in opera houses around the world.  She has recorded for Deutsche Grammophon, Philips, and Naxos Records, amongst others.  She has her own music show on Russian television and a weekly one-hour radio program, "Vocalissimo", on Radio Orphej.

Venera Gimadieva: Venera Gimadieva (Russian: Венера Гимадиева, born 28 May 1984) is a Russian operatic soprano.  She is invited to the opera houses around the world as one of the leading lyric-coloratura sopranos of her generation.  Member of the Lake Baikal Foundation Community Board.

Francesco Meli: Francesco Meli (born 1980 in Genoa) is an Italian operatic tenor particularly associated with the bel canto repertoire.  He began his vocal studies at age 17 with Norma Palacios at the Conservatorio di Musica "Niccolò Paganini" in Genoa.  He later became a pupil of mezzo-soprano Franca Mattiucci.  In 2002 he debuted in Verdi's "Macbeth" and as the tenor soloist in Rossini's "Petite Messe Solennelle" and Puccini's "Messa di Gloria", broadcast by RAI (the Italian state broadcasting company) from the Festival dei Due Mondi in Spoleto.  He has gone on to sing leading roles in La Scala, The Metropolitan Opera, Teatro Regio di Torino, London's Royal Opera House, Opéra National de Lyon, Zurich Opera, and the Rossini Opera Festival in Pesaro.  In 2017, he will make his debut as Verdi's Don Carlo at La Scala and as Radames in Salzburg next to Anna Netrebko's Aida.

Ekaterina Scherbachenko: Ekaterina Scherbachenko (Russian: Екатерина Щербаченко , "Yekaterina Shcherbachenko"; born 1977) is a Russian operatic soprano.  She was the 2009 winner of the BBC Cardiff Singer of the World competition.  In April–May 2011 she appeared at La Scala, singing the role of Liù in "Turandot".

Valeria Stenkina: Valeria Stenkina (Russian: Валерия Стенкина ) is a Russian operatic soprano and Meritorious Artist of Russia.

Marcello Giordani: Marcello Giordani (birth name Marcello Guagliardo; born 25 January 1963) is an Italian operatic tenor who has sung leading roles in opera houses throughout Europe and the United States.  He has had a distinguished association with the New York Metropolitan Opera, where he has sung in over 200 performances since his debut there in 1993.  (He is not to be confused with another Italian tenor, Massimo Giordano, who toured with Anna Netrebko in 2009.)

Opus (Schiller album): Opus is the eighth studio album of the music project Schiller created by the German electronic musician Christopher Von Deylen.  The album was announced on  01, 2013 (2013--) and was released on  30, 2013 (2013--) .  On this album Schiller has collaborated with Russian operatic soprano Anna Netrebko, French pianist Hélène Grimaud and German classical oboist Albrecht Mayer.  Opus is the first release of the new label "Panorama" by Deutsche Grammophon.  The album reached in its first week number 1 of the German albums chart and number 6 in Switzerland and number 10 in Austria.  These are the highest entries of Schiller in Austria and Switzerland and the fourth number-1-album of Schiller in Germany.  Schiller has received a Gold award in Germany in December 2013 for 100.000 sold albums of Opus.  In 2014 there will be a reedition of the album: "Opus - White Album".

Supporting paragraphs: Marcello Giordani Anna Netrebko
Answer: Massimo Giordano