Yeah, it's totally for the sound it makes with those split single-coil pickups that are wound in opposite directions so they are actually humbucking. I think it's because its a basic, heavy, bass sound without as much nuance as the Jazz. It's very effective and LOTS of recordings were done with it. Session players almost always have one in their stable because studios will often request it - they know how to get the sound they want out of a Fender P-bass. Luckily most of them also know how to mix a Jazz Bass into their mix too.I know a lot of guys have a P bass as their weapon of choice. What is it about that model that would make you choose it over a J bass? I own both 4 and 5 string J basses and every time I pick up a P it just doesn't speak to me. Perhaps it's because I'm used to the neck on a J? I dunno. Sound is so nuanced anyway.
So what is it about P basses that grab you?
Personally, as you can see in my avatar, I play a Jazz Bass and I have since I bought my '65 Jazz in 1966...yeah, I'm an old fart. But I just love the sound I get out of my Jazz with everything dimed and my amp running flat except for a little boost at ~250Hz. Just love it!
If I ever get a P-bass though, I will get it with and early 60's shallow C-shape neck with a 7.25 radius, which is exactly what I had on my '65 and also what I have on my Jazz ('82 MIA). The neck on the P-bass has always been off-putting to me. It just feels clunky. Surprisingly, my grandson has a Squier P-bass with the P-bass split pickups in their normal position as well as the Jazz bridge pickup, and the neck on his is actually pretty shallow and far more comfy that other P-basses I've tried.
But really, the P-bass has a pretty specific and well known sound and that's why they play it. I'll keep my Jazz thank you!

