Since another thread threw in a possible mismatch between keys as singing and guitar arrangement are concerned, I wonder how guitar players manage this issue. In other words, did you have to find your singing range and most comfortable key ? Did it occur naturally or did you have to adjust because you did hit a wall ? I once read one could take his guitar, vocalize along the notes to find his/her lower and higher notes and define comfortable key somewhere in the middle of these extremes. How did you do ?