an Entity references as follows:
András Keller (born 1960) is a Hungarian violinist and a founder of the Keller Quartet. He also works as a director and conductor of Concerto Budapest. At the age of 7, Keller began playing the instrument and seven years later was admitted to the Liszt Academy of Music, where his teachers were Dénes Kovács, György Kurtág, and Ferenc Rados. Later, he moved to Salzburg, where he attended its college and studied with Sándor Végh.