A version of Robert Gjerdingen's Prinner schema (2007), the "modulating Prinner" (hereafter "MP") was cited by Gjerdingen and Vasili Byros (2012) as being a way to launch a sonata-form transition, citing examples of this in instrumental works. Nathan Martin (2016) and Graham Hunt (2017) would later extend this discussion to operatic sonata-forms. The paradigmatic model of an MP descends stepwise (with parallel 10ths in an upper voice) from 4̂ in the subordinate key (re-interpreted from the home-key 1̂) to scale degree 1̂, often with the leading tone (#7̂) introduced en route in an upper voice to highlight the Based on a corpus study of arias by Haydn and Mozart, this study examines a wide variety of MP's that initiate (or participate in) a sonata-form transition section, as well as some of the harmonic nuances that arise, particularly in some of the variants.