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So it just compiles complete lines from various songs?

"For a chance at romance I would love to enhance" http://genius.com/Big-daddy-kane-the-day-youre-mine-lyrics

"Haha I'm just playin' ladies you know I love you." http://genius.com/53823

Its corpus is existing songs but I think it's more like it generates lines based on the previous lines while aiming to stick to the subject matter and optimize rhyme density.

I assumed that too, but all of the lines seem to be 1:1 copies.

I skimmed through the paper. All of the lines are 1:1 copies, it does not generate its own 'unique' lines. Instead you provide it a keyword (in this case love) and it will find phrases with the word 'love' (in the database of lyrics) in it that rhyme with the previous line.

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