I just looked up the Sugarcubes bio...you can't make this shit up:
When they hit big with their first album, the lineup was Bjork Gudmundsdottir (vocals), her husband Thor Eldon (guitar), Einar Benediktsson (vocals/guitar), Bragi Olafesson (bass), Siggi Baldursson (drums), Einar Mellax (keyboards).
And then...(per AMG)..."by the time the group recorded its second album, Thor had divorced Björk and married Magga Ornolfsdottir, who became the group's keyboardist after Einar Mellax left. Furthermore, Olafesson divorced his wife — who happened to be the twin sister of Baldursson's wife — and married Benediktsson, making their union the first openly gay marriage in pop music."