Currently I play rock in one band, which my Lakland 55-94 is perfect in. But I also back up a show choir, and most of the stuff we play is jazz, and some classic rock. I am looking into getting a MIM Standard Passive Jazz, but I have a few questions: 1) How necessary is it to have a jazz bass in my arsenal? 2) What are the advantages? 3) Since I have never owned a passive before, what are the pros/cons?