Q:Information: - An orchestra is a large instrumental ensemble typical of classical music, which features string instruments such as violin, viola, cello and double bass, as well as brass, woodwinds, and percussion instruments, grouped in sections. Other instruments such as the piano and celesta may sometimes appear in a fifth keyboard section or may stand alone, as may the concert harp and, for performances of some modern compositions, electronic instruments. - Ruggiero Eugenio di Rodolfo Colombo (January 14, 1908 September 2, 1934), known as Russ Columbo, was an American baritone, songwriter, violinist and actor. He is famous for romantic ballads such as his signature tune "You Call It Madness, But I Call It Love" and his own compositions "Prisoner of Love" and "Too Beautiful For Words." - Iosif ( Joseph ) Davydovich Kobzon ( Russian : ; born September 11 , 1937 ) is a Russian singer , known for his crooner style . - Harry Lillis "Bing" Crosby, Jr. (May 2, 1903 October 14, 1977) was an American singer and actor. Crosby's trademark warm bass-baritone voice made him one of the best-selling recording artists of the 20th century, having sold over one billion records, tapes, compact discs and digital downloads around the world. - Crooner is an American epithet given to male singers of jazz standards, mostly from the Great American Songbook, backed by either a full orchestra, a big band or a piano. Originally it was an ironic term denoting a sentimental singing style made possible by the use of microphones. Some performers, such as Russ Columbo, did not accept the term: Frank Sinatra once said that he did not consider himself or Bing Crosby "crooners". Given the information, choose the subject and object entities that have the relation of 'voice type'.
A:
joseph kobzon , baritone