A "--" in the district column means, that the town is a district-free town, i.e. it is by itself a district.
... 1995 Buffy Sainte-Marie[?] 1996 David Clayton-Thomas[?] 1996 Denny Doherty[?] 1996 John Kay[?] 1996 Dominic Troiano[?] 1996 Zal Yanovsky 1997 Gil Evans[?] ...