Are you curious to know how 19th century guitarists played their music? Now that so many method books of the era have been translated, we can find information and apply it to pieces from the era.
Rather than limiting us, this can actually free us to have more choices and make our interpretation unique. It also makes playing this music more fun in general!
Mood and Character
Harmony and it's effects
Quotes are from these sources:
Mood and Character: Fundamental Harmony, by Daniel Nistico. Self-published, 2017
Accentuation: Musical Performance in the Time of Mozart and Beethoven, by Fritz Rothschild. Oxford University Press, 1961
Dynamics: New Guitar Method, by Dionisio Aguado. Trans. Brian Jeffrey, Tecla, 1981 (republished 2005)
Harmony: see Rothschild
Vibrato: Guitar School, by Sidney Pratten. Boosey and Sons, London, 1859(?)