In the end, I feel like...now what? what or how am I supposed to use this to move to the next song?
Well, what do you want to do next? Do you want to:
1. play this song in a cover band with other people and play it note-for-note (as it is played on the recording); or
2. are you learning it to better your improvisational skills and hopefully play this song with jazz musicians, improvising as you play, and improvising your line to match what they are playing, so you are having a conversation with them through music?
…
I get it but what I am I supposed to be taking out of this? I feel like I memorize the line
If your goal is #1, then you’re done with this song. Just keep memorizing the line and play it the same way everytime. Move on the next song when you’re ready.
If your goal is #2, how well have you internalized this chord progression? Can you find a 10 minute version of the song (played by someone else), and improvise over the chord changes (improvising thoughtfully and knowing exactly what and why you’re playing it) and not get lost without reading from a transcription or chord chart? Are you playing along with soloists ideas and contributing your own off of them, playing the line that you’re making up in your head as you go, or are you just playing random 1353 patterns?
This is kinda why this is the “cheaters method” of learning jazz. It’s perfectly fine if your goal is #1, but and it’s helpful if it’s #2, but it also makes it easy, and being able to improvise over a 10 minute song, while never repeating the same line twice, and playing with the soloists ideas comes from hard work that does not come easily.
Generally speaking, with jazz, to really learn a tune, you should not be learning it off transcriptions. You should be learning it from your ear. Start with the melody and then then the bassline (and these two should inform you what the chord progression is). There are a few reasons for this: 1, it helps you internalize the melody and chord changes so that you can feel them and know them instinctively and you won’t need sheet music because you won’t get lost; 2. If helps you to be able to hear what the other musicians are playing - how are you going to have a conversation with them in real time, if they play a catchy line that you could repeat back to them, if you don’t know how to play it yourself? 3. It also helps you be able play what you hear in your head (which is the most important skill for an improvising musician - you don’t want to just play random patterns because you know they work theoretically. You want to capture those great musical ideas you are hearing and play them aloud accurately. This is ultimately what makes jazz such a great genre - every musician is in the moment, playing along with each other and conversing with each other musically, and it’s being captured on a recording to be listened to by everyone).
Again, I highly recommended either (or preferably both) Ed Fuqua’s “walking bassics” and/or Mike Downes’s “The Jazz Bass Line Book”. You do not want to just play 1353 lines over and over. That won’t sound good after 10 seconds. You want to understand the more musical ways of constructing walking bass lines so that you can create your own, as well as it will help you to understand why other bassists played what they they played on the bass lines you transcribed…. I feel like if you were going to do that now, you would just assume whatever they played (especially if it wasn’t diatonic) was “random” and that couldn’t be further from the truth. Every note they’re playing, they’re playing for a reason, and you should be able to identify that reason… That’s not to say that every bassline recorded is perfect, but it’s not random. If in your transcription and analysis, you find something you think could’ve been played better then that’s great! You’re growing and creating your own voice! You ultimately want to learn these tools to come up with the best basslines you possibly can on the spot and keep the music evolving. That is what will make the music musical and will set you on a path of endless discovery and refinement.
And I’ll keep the last bit short. Start playing with other people - other beginner jazz players who are seriously looking to grow. Nothing will kick your ass and get you into working shape faster than playing with others.