Can I bring my guitar with me on the Camino de Santiago?
It depends how important it is to you. If you can handle the additional weight, there is no reason not to take it. If you can really play the guitar it can cause one of the magic highlights for your camino friends. However, you should be a little careful about when you play it in the albergues as people really need and want to sleep and would probably not enjoy it in the evening. Afternoons should be OK.
Nothing unnecessary just exactly what you need for your Camino