Anyone know where to find or buy scores/tabs for nagauta? Beginner, Traditional, Modern songs, anything is fine. I currently live in Japan if that helps.
Almost any wagakki store will sell song books for nagauta, so you should inquire at your local shop.
長唄の譜本 is what you’re looking for.
If you’d prefer the net, you might look into Shamisen Rakuya (http://shami1000rakuya.com).