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I combined both versions of that one melody from the Festival Colored in Twilight event in Project Sekai and arranged it as a marimba duet. Honestly it's a cool piece of music that despite being pretty important to the story in the even, isn't available on the official soundtrack so I had to piece this together from 2 seperate youtube videos with the songs by themselves (in 2 different keys ahhh)...but I think I liked how it turned out overall.