What would be a good alternative acoustic duet for a male and female?

For our Thespian Coffeehouse, my guy friend and I want to do a duet, and he wants to play the guitar. We’re both strong singers, and are pretty versatile. We just don’t know what song to do, because it has to be able to be done with virtually a guitar only, and it has to have both a male lead and a female lead, along with the alternative genre. Suggestions?

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