I'm brand new to playing the bass, only one month of experience so far. I have picked up major scales quite easily and am working on the rest of them. Major arpeggios are no problem either. My question is exactly how are certain bass lines put together? My brother is a guitar player of 20 years and I am learning in order to play with him(also because Paul Mccartney is my all time hero). He has given me some chord progressions that he is turning into song and has given me the task of writing bass lines for them(he is also kind of teaching me the rudiments, so this is part of my practice scheme.) The problem is that I am having a hard time doing anything other than root notes. I know this is the basis for all bass lines(most, not all), but I would like to add some pizazz to the lines. What exactly am I missing in terms of how to go about it. Adding to root notes with approach notes is what I am thinking, but I'm not sure how to go about it. Any help is appreciated.