I had the good fortune of running into a tenor I went to college with. He is a retired opera singer, and we have been getting together reading Arias, and Neapolitan songs. A lot of the music (especially the Neapolitan stuff), is in nice easy keys. We actually made a recording, and rather than playing a song written in G, we did it in Gb, and rather than learning it in Gb, I just tuned all of my strings down a half step. I kept the guitar tuned down for a month, it worked very well. He is talking about recording several other pieces we have been working on, and has said he wants to tune them all down, a half step, whole step, one he wants to tune down 2 steps.
Im wondering how low can I tune the guitar down-I really do not want to make these easy pieces extremely difficult(for me), especially after I have already learned these pieces.