
Erin Wall, a native of Calgary, Canada, was a finalist at the 2003 Cardiff Singer of the World competition. She had made her international debut the previous year singing Britten's War Requiem in London. She spent three seasons building repertoire at Lyric Opera of Chicago, and made her Met debut in 2009 as Donna Anna. In 2014, I had the pleasure of hearing her as Strauss's Arabella at The Met.
Erin Wall's repertoire includes Freia, the 3rd Norn, Strauss's Daphne, Marguerite in Faust, Ellen Orford, Chrysothemis, Helena in Britten's Midsummer Night's Dream, Thais, and Mozart's Contessa Almaviva. She does a lot of concert work, most notably the Mahler symphonies 2, 4, and 8, and Strauss's Vier Letze Lieder.
Erin Wall - Vier letzte Lieder ~ Frühling

Counter-tenor Matthias Rexroth was born in Nuremberg and made his debut in Purcell's King Arthur at Stuttgart in 1999. Having won major voice competitions at Barcelona and Vienna, Mr. Rexroth was soon performing Bach and Baroque works all over Europe, and he represented Germany at the 2003 Cardiff Competition. He sang often with conductor Nikolaus Harnoncourt, and also with Riccardo Muti and Rafael Frühbeck de Burgos. His operatic repertory covers numerous Handel roles and ranges from Monteverdi to Britten.
Watch Mr. Rexroth singing at the the 37th Concurso Francisco Viñas in Barcelona here.
Since 2014, Mr. Rexroth has been professor of voice at the Opera Academy of Warsaw; he also gives masterclasses internationally.
Parts of Ms. Wall's and Mr. Rexroth's 2003 Cardiff performances are heard here:
Cardiff 2003 - Matthias Rexroth - Erin Wall

Bucharest-born Ruxandra Donose came to prominence following an impressive showing at a voice competition at Munich in 1990. She soon joined the opera company at Basel, and - thereafter - the Vienna State Opera. Her international career has since continued apace, and lately she has taken on roles like Kundry and Sieglinde.

Above: Ruxandra Donose as Nicklausse in Contes d'Hoffmann; a Marty Sohl/Met Opera photo
I met Ruxandra in 2004 while I was working at Tower Records; she was singing Nicklausse at The Met and she stopped by at the opera room. We had a lovely chat.
Here's Ruxandra at the 1993 Cardiff competition:
Ruxandra Donose - Allerseelen - Cardiff 1993
And Roger Vignoles is the pianist for Ruxandra's lovely singing of Dalila's seduction aria from a 2014 London recital here.

Vasily Gerello was born in the village of Vaslovtsy, Ukraine. In 1991 he graduated from the Saint Petersburg State Conservatory, having already been invited - while still a fourth-year student - to join the company of the Mariinsky Theatre.
Gerello made his Mariinsky debut as Valentin in Faust. Shortly after, he appeared in the role of Onegin and as Rodrigo in Don Carlo. Gerello was the first baritone at the in Mariinsky to sing Germont in La Traviata in the original language.
He competed at the 1993 Cardiff Singer of the World:
Vasily Gerello ~ Cardiff 1993
Gerello's international debut was as Rossini's Figaro at the Dutch National Opera. With the company of the Mariinsky Theatre, he has performed in Spain, Italy, Scotland (Edinburgh Festival), Finland, France and Portugal. He has sung at the world's great opera houses, including the Bastille. Deutsche Oper Berlin, Berlin State Opera, Metropolitan Opera, the Vienna State Opera, Covent Garden, La Fenice, and La Scala. He speaks Italian, Spanish, English, Ukrainian and Russian fluently.

Above: Vasily Gerello as Napoleon Bonaparte in War and Peace
At the Metropolitan Opera, Gerello gave more than fifty performances, debuting in 1997 as Alfio in Cavalleria Rusticana and later appearing as Napoleon Bonaparte in War and Peace, Count Tomsky in Pique-Dame, Marcello in Boheme, and Sharpless in Madama Butterfly.
Mr. Gerello sings the beloved Pearl Fishers duet with tenor Ramon Vargas:
Ramon Vargas & Vasily Gerello - Au fond du temple saint ~ PEARL FISHERS
And here is a song from the baritone's homeland:
Vasily Gerello - Misjats na nebi (Moon in the Sky) ~ Ukrainian song
~ Oberon