There are at least two bands called Cretins or The Cretins: One is a German early 80s punk band from Hannover. The other one is a an American Pop Punk Band which started to perform in the 90s. 1)
The German Cretins released one self titled 7' EP in 1980 another 10' EP called Man Between Walls in 1985, a split 7' single with Blut + Eisen and a couple of compilation songs. 2)


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