Reddit mentions of Playing Keyboard Bass Lines Left-Hand Technique for Keyboards

>What's the #9 of Bb7

My method for reading chord symbols works like this. Think in the major key of the root, and then follow in the instructions given. The first one is the chord's name. Bb in this case tells you that you're playing a Bb major triad. If you see a m after (Bbm) that means to lower the 3rd.

If you have a 7, it's telling you to add the dominant 7 (b7). So Bb major triad with a b7 (Ab). If it said BbMaj7 you'd use the major 7 (the diatonic one... A). If you have Bbm7 the m still only applies to the 3rd. The m and the 7 are two separate instructions. You can have a BbmMaj7. If you get Bb9, this adds the 9th but implies the b7 as well (because b7 is what gives the chord is functional quality). Similarly Bb13 implies the b7 and use of the 9th and 11 are at your discretion and is a voicing issue.

The next portion is where it tells you about any alterations or extensions. So if you have a Bb7#9, you play the Bb7... and just add the #9 (C#). It's possible to have more instructions like Bb7#5#9 or Bb13b9. Just following the instructions.

>Don't even get me starting on walking basslines, that shit is impossible

It's difficult and just requires a lot of understanding of where you're starting, where your destination is, what scales to use, and what contingencies to use about placing chromatics or changes of directions to help you get where you want when you want. This book is fantastic for working on it.

>This is shit I'll play video games instead

I wouldn't give up entirely, but playing video games is a good way to take a mental break from the rigors of actual practice. If you're actually practicing, you'll likely make your brain tired and need a break. Too many people boasting about their umpteen hours of practice a day are barely practicing. They are noodling or polishing the same crap they are already moderately proficient at. If you're "practicing" for hours at a time without getting tired, you're likely not really accomplishing much.

>I have 5 years of classical experience, I know my theory quite well, I can read well enough for lead sheets.

Drop any sense of accomplishment if you want to make progress. Realizing how much you suck is the best way to improve. I loved theory in college. I learn a lot of it and went above and beyond in my classes. After getting into the real world and learning jazz theory I realize how little actually knew previously. What I learned in college over 6 semesters was probably about 15% of the theory knowledge I have now and only about half of that was relevant to anything in the larger musical picture while much of it was a waste of time (I'm looking at you augmented 6 chords...). Any theory knowledge you have is the tip of the iceberg. The ability to read the right hand of a lead sheet which is essentially a single note melody is barely an achievement in and of itself. It's such a small portion of the whole picture of actually realizing a lead sheet and making it into music.

It's about as useful as saying "I can read the top note in the first beat of every bar of Pathetique." Well... that doesn't make you able to play Pathetique and doesn't even suggest you're close.

And I'm not saying this to shit on you either. For all the information that I know I'm aware of the absolute oceans of stuff I don't know yet. I just find that I'm willing to accept it and pursue it while I find that many people (especially younger people) are more interested in propping themselves up on what they have accomplished rather than working on what they haven't.

This is better than those other 2:

https://www.amazon.com/gp/aw/d/0793569273/ref=ya_aw_od_pi?ie=UTF8&psc=1