If there was one musician in mid-nineteenth-century Paris who diligently promoted Polish accomplishments, it was Albert Sowinski (Wojciech Sowiński). From his arrival in France in 1828 until his death in 1880, he championed the Polish cause as a performer, composer and scholar. Sowinski was a prolific writer, but with the exception of his Les musiciens polonais et slaves, anciens et modernes, Dictionnaire (1857), his studies of Polish repertoire rarely receive more than passing attention in modern scholarship. In this essay, I investigate Sowinski’s developing paradigms of Polish nationalism and Polish identity across the entirety of his major writings about and collections of Polish music: Chants polonais nationaux et populaires (1830), Chants de la révolution du 29 novembre 1830 (1830), Mélodies polonaises album lyrique (1833), ‘Chants populaires de l’Ukraine’ (1842), ‘De l’état actuel de la musique en Pologne’ (1842), Dictionnaire (1857) and Chants religieux de la Pologne, Op. 93 (1859). The four works from the 1830s, which focused on Polish folk music and revolutionary songs, were closely tied to Sowinski’s work with Léonard Chodzko (Leonard Chodźko) and his circle in Paris. Especially in the Chants polonais, Sowinski followed Chodzko and Joachim Lelewel in emphasising the exceptional geographic, linguistic and even ethnic diversity of the old Polish–Lithuanian Commonwealth, viewing this diversity as the basis for a glorious musical and political future. By contrast, in his critical writings of the 1840s, Sowinski interpreted Ukraine’s folk traditions as speaking largely to regional experience; he cast Warsaw and its musical institutions as the basis for a modern Polish musical identity. By the time of his Dictionnaire and Chants religieux de la Pologne, Sowinski de-emphasised Poland’s musical exceptionality in favour of delineating its long tradition of exchange with Western Europe, facilitated particularly through courts and the Roman Catholic Church.