Question:  Samvel Alumyan was a Soviet-Armenian classical pianist and frequent collaborator with a violinist many considered to be among the greatest violinists of what?

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Manuel Quiroga (violinist): Manuel Quiroga (15 April 189219 April 1961) was a noted Galician violinist of the early 20th Century, whose career was cut short by a traffic accident in New York in 1937.  He was repeatedly billed by music critics as "the finest successor of Pablo de Sarasate", and he is sometimes referred to as "Sarasate's spiritual heir".  Enrique Granados, Eugène Ysaÿe and other composers dedicated compositions to him.  The greatest violinists of the time – Ysaÿe, Fritz Kreisler, George Enescu, Mischa Elman and Jascha Heifetz – as well as composers such as Igor Stravinsky and Jean Sibelius, held Quiroga's artistry in great regard.  Guilhermina Suggia, the Portuguese cellist (and one-time companion of Pablo Casals), described his playing of Tartini's "Devil's Trill Sonata" as "marvellous and flawless".

Richard Farrell: Richard Farrell (30 December 1926 – 27 May 1958) was a New Zealand classical pianist who achieved almost legendary status, but whose flourishing career was terminated in a road accident at the age of 31.  He has been described as New Zealand's "greatest classical pianist".

Martan Mann: Martan Mann is an American jazz pianist and educator living in Boulder Creek, California.  He performs with the Martan Mann Trio, the Martan Mann & Mannkind (contemporary jazz band) and has performed with George Young and Dmitri Matheny.  A graduate of San Jose State University, San Francisco State University, Hawaii Pacific College, and the University of Hawaii, he is a musical director at Capitola Theater in Capitola, California and is on the board of directors for the Jazz Society of Santa Cruz, California.  Jazz educational books include "Jazz Improvisation for the Classical Pianist" (1989), "New Age Improvisation for the Classical Pianist" (1994), and "Improvising blues piano" (1997).  He is also the author of an jazz educational DVD, "Jazz Skills for Piano".

Jonathan Paul Cambry: Jonathan Paul Cambry (born 1982) is an American classical pianist, teacher, composer and producer from Chicago, Illinois.  He has performed at multiple locations around the world, most notably the Chicago Symphony Center as part of the 2012 Chicago Piano Day curated by concert pianist and Grammy-winning Soviet-born naturalized American classical pianist, Emanuel Ax.  Pianists at this festival included world-renowned pianists Jorge Federico Osorio, Jeremy Denk, Reginald Robinson, Marc-André Hamelin, Orli Shaham, Valentina Lisitsa, Bill Charlap, Renee Rosnes and others.

Samvel Alumyan: Samvel Alumyan (Armenian: Սամվել Ալումյան ; 1941–1987) was a Soviet-Armenian classical pianist, winner of the George Enescu International Piano Competition in 1967 (a prize shared ex-aequo with Radu Lupu).  He was a student of Yakov Flier at the Moscow Conservatory (graduated in 1966), later becoming his assistant.  He was a frequent collaborator of violinist Leonid Kogan, with whom he toured and recorded.  During his years teaching at the Moscow Conservatory, one of his students was pianist Ksenia Knorre, daughter of Vera Gornostayeva, and mother of pianist Lukas Geniušas.

Yehudi Menuhin: Yehudi Menuhin, Baron Menuhin, (22 April 191612 March 1999) was an American-born violinist and conductor who spent most of his performing career in Britain.  He is widely considered one of the greatest violinists of the 20th century.

Long-Thibaud-Crespin Competition: The Long–Thibaud–Crespin Competition is an international classical music competition for pianists, violinists and singers that has been held in France since 1943.  It was created by the pianist Marguerite Long and the violinist Jacques Thibaud.  Thibaud died in 1953, Long in 1966.  Until 2011 it included only pianists and violinists and was known as the Marguerite Long–Jacques Thibaud Competition.  That year, in honour of the French soprano Régine Crespin (1927–2007), it was expanded to include singers, and renamed.

Ilona Feher Foundation: The Ilona Feher Foundation was established in 2003 as a nonprofit organization committed to nurturing the artistic development of exceptional young Israeli violinists.  The foundation honors the late violin pedagogue Ilona Feher (1901-1988) whose guidance helped shape some of Israel's greatest violinists, notable Pinchas Zukerman, Shlomo Mintz, Shmuel Ashkenasi, Hagai Shaham and Ittai Shapira.

Leonid Kogan: Leonid Borisovich Kogan (Russian: Леони́д Бори́сович Ко́ган ; Ukrainian: Леонід Борисович Коган ; November 14, 1924 – December 17, 1982) was a preeminent Soviet violinist during the 20th century.  Many consider him to be among the greatest violinists of the 20th century.  In particular, he is considered to have been one of the greatest representatives of the Soviet School of violin playing.

Pinchas Zukerman: Pinchas Zukerman (Hebrew: פנחס צוקרמן‎ ‎ , born 16 July 1948) is an Israeli violinist, violist and conductor, widely regarded as one of the greatest violinists of the second half of the 20th century.

Supporting paragraphs: Samvel Alumyan Leonid Kogan
Answer: the 20th century