Among the highlights of past festivals were : Luther Allison , Junior Wells , Koko Taylor , Carey Bell , John Cephas and Phil Wiggins , C. J. Chenier , Nora Jean Bruso , Rory Block , Little Charlie & the Nightcats , as well as many Polish blues legends such as Tadeusz Nalepa , Slawek Wierzcholski , Dżem and many others .