 Leonarda's sonatas, however, are unusual in their formal structure.It is generally held that Arcangelo Corelli established the “standard” four-movement, slow-fast-slow-fast form of the "sonata da chiesa".Leonarda's sonatas, however, vary from as few as four (Sonatas 6 and 9) to as many as thirteen (Sonata 4), and her sonatas in four sections do not follow the slow-fast-slow-fast model.