I think I've told this story on TB already, but it applies here.
I think I have a natural tendancy toward bass. When I was a kid (yes I was one of those once) we would play "band" in the basement. When to other kids would grab sticks or knitting needles, and tennis or badminton raquets, I'd grab the corn broom, and play along with the bass. In HS, when someone had a radio on, I'd hook my thumb on my pocket, and use my fingers to play along. Eventually, I got a job and bought my first cheap bass, and worked my way up from there. Self taught, as I could never afford a teacher. Got the Hal Leonard book, and tried to learn songs I liked. Tried Pink Floyd's Money first.
Went on to some ZZ top, and built up. 
I think I have a natural tendancy toward bass. When I was a kid (yes I was one of those once) we would play "band" in the basement. When to other kids would grab sticks or knitting needles, and tennis or badminton raquets, I'd grab the corn broom, and play along with the bass. In HS, when someone had a radio on, I'd hook my thumb on my pocket, and use my fingers to play along. Eventually, I got a job and bought my first cheap bass, and worked my way up from there. Self taught, as I could never afford a teacher. Got the Hal Leonard book, and tried to learn songs I liked. Tried Pink Floyd's Money first.
