Sonatinas -- See Sonatas Here are entered collections of miscellaneous compositions for one or two solo instruments written in sonata form. Separate sonatas and collections of sonatas for a specific medium are entered under the heading followed by specification of medium.Compositions written in sonata form for three or more solo instruments are entered under headings for chamber music, e.g. Piano quartets; Piano trios; Quartets; String quartets; String trios; Trios; Wind trios.