Sonata-rondo is a type of musical form which could be formulated as ABA C ABA and most commonly existing on the last movements of sonatas, concertos, symphonies or similar genres. The second episode C might be in a new thematic character in some pieces, as well as it might be a development section in some others. The ABA revival following this episode could be abbreviated or even sometimes A, the rondo themes, could be omitted. There are several differing references on the inventer of sonata-rondo. Basing on the literature survey, four pieces come to the fore: 1) Joseph Haydn. String Quartet, Hob.III:3, D Major, V. Movement (1764)? 2) Wofgang Amadeus Mozart. String Quartet, Nr. 4, KV 157, C Major, III. Movement (1773) 3) Joseph Haydn. Symphony, Hob.I:64, A Major, IV. Movement (1775) 4) Joseph Haydn. Symphony, Hob.I:77, Bb Major, IV. Movement (1782) Considering the sonata-rondo norms accepted today, is it any possible to call any of these four pieces as sonata-rondo form? In order to find an answer to this question, a series of works have been started. In this frame, at the 3rd International Music and Dance Congress held in Marmaris in 2017, the related movements of Haydn’s 64th and 77th symphonies were examined and it was demonstrated that none of these two works are in sonata-rondo form. In this study, form analysis of Mozart’s and Haydn’s string quartet movements mentioned above will be carried out and an answer for the possible inventer of sonata-rondo form is going to be found.

Sonata-Rondo, Form Analysis, Haydn, String Quartet, Hob.III:3, Mozart, String Quartet, Nr. 4, KV 157