Complete non-violence is complete absence of ill-will against all that lives. It therefore embraces even sub-human life, not excluding noxious insects and beasts. They have not been created to feed our destructive propensities. If we only knew the mind of the Creator, we should find their proper place in His creation.
Each acoustic guitar has its own character and personality. On a particular day, I might pick one up and start noodling around, looking for some emotional content in the chords.