The rondo or rondeau is a musical form that contains a principal theme which alternates with one or more contrasting themes. Some possible patterns include: ABACA, ABACAB, ABACBA, or ABACABA.
Title page of Franz Rigler's "Three Rondos" (1790)
A piano concerto, a type of concerto, is a solo composition in the classical music genre which is composed for piano accompanied by an orchestra or other large ensemble. Piano concertos are typically
Beethoven's Piano Concerto No.3 about to be performed at the Philarmonie de Paris by Mitsuko Uchida