Bartók’s Concerto for Orchestra, one of the most performed 20th century works, regularly featuring in the concert programme series of many leading orchestra across the world. Bartok’s Concerto for Orchestra is in five movements, arranged in, what is termed, an ‚arch’ form; the outer movements (first and fifth) are related, as are the second and fourth, and the third movement functions as the ‚keystone’ of the arch.