I have been playing bass for almost a year, so I'm certainly not very experienced. I've been hearing a lot about MM and P and J pickups, but I have no idea what they are. I've looked online, on this site, everywhere, and I can't find anything. I can only assume P and J are Precision and Jazz, but MM? And I really don't know the technical definitions of each of them...if someone could enlighten me I'd appreciate it!