A bassoon sonata is a larger-scale work for bassoon, usually with keyboard accompaniment. Most bassoon sonatas are substantial, multi-movement works, often based on Classical sonata form. Bassoon sonatinas, by comparison, tend to be shorter works, often in a single movement. Like bassoon concertos, bassoon sonatas were relatively uncommon until the twentieth century, at which point they became plentiful. During the twentieth century, the term bassoon sonata came to denote a wider range of works, including sonatas for solo bassoon and sonatas for bassoon in various duets with other instruments (such as cello or oboe).