Over the past few months, i've been trying to find a teacher in my region who wants to teach me. Unfortunately, the results have been pretty bad and no one seems to want to teach me since I play a 6 strings. I'm also involved in many other activities so I had a rough time finding time for the the few ones that i found. So, what i'm asking you here are recommendations of good books that could help me. I'm already pretty sure i'll be buying The Slap Bass Program but i'd like another one or 2 on overall technique and theory. I've been playing for a year and an half and my interests are mostly prog rock and metal. That's it, thanks already!