Hey! I'm going into high school this year and really want to join the jazz band there. I've been playing bass for some time now (about 5 years) but mostly just doing covers of songs and that type of stuff. Only recently have I started learning about music theory and reading music. I'm worried that there's too much to learn before school starts up again, it's all really overwhelming. I was wondering if anyone could tell me what the most important things to learn and practice for jazz band are. Thank you for your time!
Some of this advice has already been offered, I'll just confirm it:
School jazz combos almost always read from the chart. Now, if you have just started sight reading, your success will entirely depend upon how quickly you learn to read a chart and show up for rehearsals and performances competent and confident in your ability to play the piece through without a bunch of clams.
Your success also depends upon how badly your jazz band teacher needs a bass, and how many other bass players are competing for the slot.
It all goes go hand-in-hand.
Don't worry if you aren't the fastest sight reader right now. You will need to be competent enough to read through a piece at home, even painstakingly slow, and commit it to memory so that you only need the chart for reminders along the way. If you can get up to a pace where you can spend a few evenings studying the chart and reproducing it faithfully, you have a shot.
That is, if there are no other bass players competing for the slot who are faster, better, and more consistent than you.
Even then, many jazz band leaders like to keep a primary and an alternate at their disposal.
If you are serious and motivated, there are two details to address immediately if you haven't already:
First, I hope you are working with an instructor who will save you a lot of time and frustration by providing strategies and exercises for being a better reader. Also, you can bounce ideas like this one off him and get his feedback and suggestions. There are a lot of relatively complex rhythms and time signatures in the jazz pieces you will see, even at the middle to high school level. As a bass teacher, I helped many students get up to speed and acquire a slot in their high school jazz program.
Second, you will need to approach your school jazz band teacher when he has a little time to talk and share your aspirations. He also has great advice and suggestions. With any luck you can impress upon him your maturity and sincerity, and he will provide a few sample pieces for you to take home, study, and practice with. Most band teachers I know will do this, especially if they think the candidate may warrant an audition.
Keep in mind this is not like your regular school "concert band" music classes where the teacher is partly responsible for your musical education. Jazz band leaders will do a bit of academics, but only as it pertains to performances; school jazz bands are almost always public performance-driven, and often competitively so. You need to come in with an appropriate skill set and motivation to be a valuable asset to his program, which means you need to work with your instructor and do your homework.
Where there is a will, there is a way. I have had many first- and second-year bass students (all beginner to intermediate readers) work themselves up into a primary slot in the school jazz band. And few things grow you faster as a musician than that kind of responsibility and scheduled performances.
I hope this has helped, and good luck with it!