Usually it is written for one or more virtuoso instrumental soloists and orchestral or piano accompaniment.
[3] Incomplete concerto movements by Beethoven and Schubert were retroactively designated as concert pieces.
Schumann's 1841 Fantasia for piano and orchestra, in form similar to Weber's Konzertstück, was later rewritten and expanded with two further movements into his Piano Concerto Op.
[4] When the soloist is a vocalist, the piece rather belongs to the concert aria genre.
In this sense as well Chopin's Allegro de concert for solo piano as Tchaikovsky's Romeo and Juliet for orchestra can be called concert pieces.