Alice and Ellen Kessler, who died by joint assisted suicide this week, entertained – and occasionally scandalised – Europe with their glitzy and subversive pop music and classically informed dance

• The Kessler twins die together aged 89 – news

When Dean Martin announced the Kessler sisters’ appearance on his show in 1966, he remarked that he had been desperate to book them not just because the German-born dancer-singers were “so pretty and so talented”, but “also because they’re twins, that means there are two of them”. “They’re a double,” he added with a nod to his half-drunk crooner persona, “and there’s nothing I like more than a double”.

The two sisters, who died by joint assisted suicide earlier this week, also performed with Frank Sinatra, Harry Belafonte and Fred Astaire, but th

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