Musical works and exercises designed for practice with the aim of perfecting a facet of performing technique. For instrumental pieces designed for performance in order to exploit a facet of performing technique see Concert etudes
Concertos Piano With String Orchestra : First concerto for piano and orchestra, op. 9 ; Symphony no. 2, op. 19 ; Fourth concerto for piano and orchestra, op. 99 "Prague" / Dmitry Borisovich Kabalevsky