Question: Ashley Riches and Roberto Alagna are what types of operatic singers, respectively?

Context articles: Amelita Galli-Curci
Ashley Riches
Roberto Alagna
Marius et Fanny
Devriès family
Pasión (Roberto Alagna album)
Roberto Torres
Subterranean (novel)
Jussi Björling
The Complete Porgy and Bess

Amelita Galli-Curci (18 November 1882 – 26 November 1963) was an Italian coloratura soprano.
 She was one of the most popular operatic singers of the 20th century, with her recordings selling in large numbers.
Ashley Riches is a British operatic baritone.
 With The Royal Opera, Riches has sung Moralès, opposite Roberto Alagna’s Don José in Bizet's Carmen.
 In 2014, he sang Mandarin in "Turandot"
Roberto Alagna (] ; ] ) (born 7 June 1963) is a French tenor.
 He was born in Clichy-sous-Bois, Seine-Saint-Denis, France and obtained French citizenship at age 18, while also retaining his previous Italian citizenship.
Marius et Fanny is an opera ("opéra comique") in two acts composed by Vladimir Cosma.
 The libretto by Michel Lengliney, Jean-Pierre Lang, Michel Rivegauche, Antoine Chalamel, Michel Arbatz and Vladimir Cosma is based on Marcel Pagnol's stage and film trilogy "Marius", "Fanny" and "César" (known as the "Trilogie marseillaise" ).
 The opera premiered on 4 September 2007 at the Opéra de Marseille with Roberto Alagna and Angela Gheorghiu in the title roles.
The Devriès were a family of operatic singers over three generations, of Dutch descent.
 They were mainly active in France, Belgium and the USA in the second half of the 19th and the early 20th centuries.
Pasión is a 2011 crossover album by the tenor Roberto Alagna of Spanish-language standards.
Roberto Torres Born 10 February 1940; is a Cuban musician from Güines most famous for his interpretation of Simón Díaz's Caballo Viejo.
 He is considered to be one of the highest authorities in the history of the Cuban music.
 His singing career with Sonora Matancera puts him at the peaks and among the top singers of Cuba of all times.
 He has made a valuable contribution, along with Arturo Sandoval, Rosendo Rosell, Celia Cruz, and musicologist Eloy Crespo to the documentary Son, la antesala de la salsa.
 He is considered one of Cuba's highest assets in music.
 he also started the careers of many artists singers such as Billy "la voz" Quinones who is also a musician trumpeter/percussionist who at the age of 16 yrs old was Roberto Torres's lead trumpeter and music director by the age of 18.
 Billy la voz Quinones now sings on his solo CD project as he dedictes to Roberto his version of Caballo Viejo in a new Latin Kompa style in which Billy la voz calls Kompalsa a mix of Haitian French caribbean sounds with charanga vallenato rhythms.
Subterranean is a novel by James Rollins.
 Beneath the ice at the bottom of the Earth is a magnificent subterranean labyrinth, a place of breathtaking wonders – and terrors beyond imagining.
 A team of specialists led by archaeologist Ashley Carter has been hand-picked to explore this secret place and to uncover the riches it holds.
 But they are not the first to venture here – and those they follow did not return.
 There are mysteries here older than humanity, and revelations that could change the world.
 But there are also things that should not be disturbed – and a devastating truth that could doom Ashley and the expedition: they are not alone.
 For the caverns are inhabited by an entire subterranean ecosystem of primitive mammals - some intelligent, others savage, all beyond the reach of today's knowledge.
Johan Jonatan "Jussi" Björling ( , ] ; 5 February 19119 September 1960) was a Swedish tenor.
 One of the leading operatic singers of the 20th century, Björling appeared for many years at the Metropolitan Opera in New York and less frequently at the major European opera houses, including the Royal Opera House in London and La Scala in Milan.
This 1956 recording based on George Gershwin's opera Porgy and Bess was the second "complete" recording of the opera after the 1951 version, and the first recording of the work to feature jazz singers and musicians instead of operatic singers and a classical orchestra.