Why is the ethnomusicologist, Bela Viktor Janos Bartok's Piano Concerto No. 2 in G major considered notorious?
Piano Concerto No. 2 (Bartók): Béla Bartók's Piano Concerto No. 2 in G major, Sz. Piano Concerto No. 2 (Bartók):  95, BB 101 (1930–31) is the second of three piano concerti, and is notorious for being one of the most difficult pieces in the repertoire. Béla Bartók: Béla Viktor János Bartók ( ; ] ; 25 March 1881 – 26 September 1945) was a Hungarian composer, pianist and an ethnomusicologist.
is notorious for being one of the most difficult pieces in the repertoire.