Most of Chopin's compositions were for solo piano, although he did compose two piano concertos as well as some other music for ensembles. His larger scale works such as the four ballades, the four scherzi, the Barcarolle Op. 60, the Fantaisie Op. 49, and sonatas have cemented a solid place within the repertoire, as well as shorter works like his impromptus, mazurkas, nocturnes, waltzes and polonaises taking a substantial portion of recorded and performed music. Two important collections are the 24 Preludes, Op. 28, and the etudes Op. 10 and 25, which are a staple of that genre for pianists. In addition, he wrote several song settings of Polish texts, and chamber pieces including a piano trio and a cello sonata. Chopin's piano concertos (No.1 and No. 2) are two of the romantic piano concerto repertoire's most often-performed examples.