 It is ironic that, at the same time that the form was being codified (by the likes of Czerny and so forth), composers of the day were writing works that flagrantly violated some of the principles of the codified form.It has continued to be influential through the subsequent history of classical music through to the modern period.The 20th century brought a wealth of scholarship that sought to found the theory of the sonata form on basic tonal laws.