Monte Negro which is a bilingual band (English & Spanish)...omg these guys really need more attention
!!!
I also really like the duo called La Roux but Idk if they'd be considered uncommon...they don't appear to be all that popular.
I've recently come to like some of Goldfrapp's music as well
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Also..I do like some music of another duo called The Bird And The Bee.
That's all I can think of at the moment
...