Final answer:
First-movement concerto form is based on principles from the Baroque ritornello and the Classical sonata-allegro form.
Step-by-step explanation:
The statement is true. First-movement concerto form, also known as sonata-allegro form, combines elements of Baroque ritornello and Classical sonata-allegro form. This form typically consists of three sections: exposition, development, and recapitulation. The exposition presents the main themes and establishes the tonal and thematic material. The development section explores and develops the themes, often in a more dramatic and varied way. Finally, the recapitulation restates the main themes in the tonic key, resolving any tension created in the development section.