Bastarda Trio is an ensemble brought to life by Paweł Szamburski, Tomasz Pokrzywiński and Michał Górczyński. The trio surprised many by reaching for medieval music composed by the now somewhat forgotten Piotr Wilhelmi from Grudziądz. It was the works of this 15th-century artist that were the starting point for Bastarda and their work on the album Promitat eterno, based largely on the sound of clarinets and cello.