Jerry Hadley (June 16, 1952 – July 18, 2007) was an American operatic tenor. He received three Grammy awards for his vocal performances in the recordings of Jenůfa (2004 Grammy Award for Best Opera Recording), Susannah (1995 Grammy Award for Best Opera Recording), and Candide (1992 Grammy Award for Best Classical Album). Hadley was a leading American tenor for nearly two decades. He was a protégé of soprano Dame Joan Sutherland and her husband, conductor Richard Bonynge. A versatile singer, Hadley was equally at home in opera, operetta, and on Broadway.

Hadley was born and raised in Manlius, Illinois, of Italian and English parents. He attended Bradley University in Peoria, Illinois, where he was a member of the Delta Nu chapter of Phi Mu Alpha, a men's music fraternity. Hadley first studied to become a conductor, but after four years turned to singing, earning his masters degree in voice at the University of Illinois at Urbana–Champaign. At Illinois he studied voice with Grace Wilson and James Bailey, and coached with pianists John Wustman and Eric Dalheim. He starred in many School of Music opera productions, including Tamino in Mozart's The Magic Flute, Nemorino in Donizetti's Elixir of Love, Alfred in Johann Strauss Jr.'s Die Fledermaus, and Tom Rakewell in The Rake's Progress by Stravinsky.

Alan Titus (born in New York City, on October 28, 1945) is an internationally-celebrated baritone. He studied under Aksel Schiøtz at the Colorado School of Music, and Hans Heinz at The Juilliard School. His official debut was as Marcello in La bohème, in Washington, DC, in 1969. He came to prominence, however, in Leonard Bernstein's theatre piece MASS, as the Celebrant, in 1971. That same year, he created the role of Archie Kramer in Lee Hoiby's Summer and Smoke (after Tennessee Williams) in St Paul. The latter was the opera of his debut the same year at the New York City Opera, where he was a leading baritone for many seasons, participating in nationally-televised performances of Il barbiere di Siviglia (with Beverly Sills, 1976), Il Turco in Italia (1978), La Cenerentola (opposite Susanne Marsee and Rockwell Blake, 1980), and Madama Butterfly (conducted by Christopher Keene, 1982). He made his only appearances with the Metropolitan Opera in 1976, as Harlekin in Ariadne auf Naxos, with Montserrat Caballé.

Patricia Lynn Racette (born 1965) is an American operatic soprano. A winner of the Richard Tucker Award in 1998, she has been a regular presence at major opera houses internationally. Racette has enjoyed long-term partnerships with the San Francisco Opera, where she has been a regular performer since 1989, and with the Metropolitan Opera, where she has performed annually since 1995. Also active on the concert stage, Racette has appeared with many of the world's leading orchestras, including the Boston Symphony Orchestra, the Chicago Symphony Orchestra, the San Francisco Symphony, and the London Philharmonic Orchestra.

Possessing a strong, shining lyric soprano with a considerable amount of dramatic intensity, Racette has particularly excelled in the operas of Giacomo Puccini and Giuseppe Verdi. Among her most well-known roles are Violetta in La traviata; Blanche de la Force and Madame Lidoine in Dialogues of the Carmelites; both Mimì and Musetta in La bohème, the title heroine in Jenůfa; Cio-Cio San in Madama Butterfly; Alice Ford in Falstaff; Liu in Turandot; Desdemona in Otello; and Káťa in Káťa Kabanová. She has also notably performed in several world premieres, including the title role in Tobias Picker's Emmeline (1996) and the role of Leslie Crosby in Paul Moravec's The Letter (2009) at the Santa Fe Opera. She has also appeared in the premiere of Picker's An American Tragedy (2005) at the Met, and portrayed Love Simpson in the premiere of Carlisle Floyd's Cold Sassy Tree (2000) at the Houston Grand Opera.

Leo Nucci (born April 16, 1942) is an Italian operatic baritone, particularly suited to Verdi roles.

Born at Castiglione dei Pepoli, near Bologna, he studied with Giuseppe Marchese and made his stage debut in Spoleto, as Figaro in Il barbiere di Siviglia, in 1967, he then joined the chorus of La Scala in Milan, and made his solo debut there in 1975, again as Figaro.

His career quickly took an international turn with debut at the Royal Opera House in London, as Miller in Luisa Miller, in 1978, and at the Metropolitan Opera in New York, as Renato/Ancharstrom in Un ballo in maschera, in 1980. Renato was also his debut role at the Paris Opéra in 1981, and the Salzburg Festival in 1989, under Herbert Von Karajan. His career is remembered for famous performances in the opera world, including works with Luciano Pavarotti, Joan Sutherland, Placido Domingo and others.

His repertoire encompasses the entire Italian repertory from bel canto to verismo, but his sonorous voice, secure technique and dramatic abilities are best displayed in Verdi - notably as Rigoletto, Macbeth, Count di Luna, Giorgo Germont, Rodrigo, Amonasro, Iago, and Falstaff. He has sung the role of Rigoletto alone more than 400 times.

Sumi Jo (born (1962-11-22) November 22, 1962 (age 49)) is a Grammy Award winning South Korean lyric coloratura soprano known for her interpretations of the bel canto repertoire.