There are some lyrics in the song VOICE by Perfume that go:
点と点を繋げてこ
everythingを合わせてこ
I've no idea how こ functions here as I don't think I've encountered it before like this. The group are from [広島]{ひろしま} if that helps, though I couldn't find anything about it on the wiki for 広島弁. It's probably something really simple.