Zacier is a music group founded in 1984 by Mirosław "Zacier" Jędras. The name Zacier was secondarily developed as an acronym for: Zrzeszenie Artystów Cierpiących i Enuzjastycznie Rżnących. The main figure of the band is Mirosław Jędras himself, the author of the lyrics and music, who sings in the band, plays the keyboard and a variety of other instruments (including guitar, violin, pipe). The rest of the band's line-up changed frequently. One of Zacier's first songs was Odpad Atomowy, which was later performed by Kazik Na Żywo (released on the 1994 album Na żywo, ale w studio) and Elektryczne Gitary. Muzykaczka, on the other hand, is a music band formed in 2020. Muzyczka consists of vocalist and lyricist Weronika "Werka" Bilska, bassist Szymon "Szymen" Janowski, drummer, percussionist, guitarman and guitarist Michał "Mrufka" Jędras and keyboardist Tomasz "Tomek" Jędras.