Spanish or G tuing is great for Robert Johnson's music.. I hope you have fun with it.. I played in G tuning for years before playing around in D or Vestable .. They have such different voices.. G in so bright and D is so somber... What kind of bar do you use.. I like Brass the most on acustics. Glass if I'm using the Telicaster.. ( That is very seldum though at this point))
All the best Guy Wolff