What is a domestic piano piece called?

The term "Sonata" refers to a specific form and genre of domestic piano composition. Typically, a sonata for piano is structured in several movements, with the first movement often presenting a sonata-allegro form. This genre emerged prominently during the Classical period and has remained central to piano literature, often being composed for the purpose of home performance.

The versatility of the sonata allows for personal expression and musical exploration, making it a favored choice among composers for domestic music-making. This aligns with the evolution of the piano as a central instrument in home environments, where amateur musicians could engage with these pieces.

In contrast, the other options represent larger orchestral works or different performance contexts. A concerto usually involves a solo instrument alongside an orchestra, which is not typically associated with domestic music. A Concerto Grosso is a form for multiple soloists and an orchestra, also distancing itself from the intimate setting of home music making. A symphony encompasses a full orchestral work, generally designed for concert hall performance rather than for personal or domestic enjoyment. Thus, within the context of domestic piano repertoire, the sonata stands out as the correct choice.