After scouring the web for an answer to this question, I've now wasted 2 hours of my practice time. Arpeggios. I can find plenty of videos and web sites trying to explain different Arpeggios to play but no one says "why" you learn them or "when" to use them. My Hal Leonard Bass Method books don't appear to even mention them (unless I've over looked that section in my frustration). I've wasted valuable playing time which has my blood pressure boiling. Nothing frustrates me more than instruction where all sorts of information is glossed over or passed under the assumption the student already knows it. Thats what this feels like. Help would greatly be appreciated.