I'm nine weeks in to learning bass. Realistically, at what point did you begin to memorize bass lines? I don't have anything memorized and still work off of tab as well as beginning to learn music notation sight-reading. First week doing that. But memorization. When did ya'll start?
When I found out I was dyslexic..LOL..Seriously, there really is no difference than singing a song you heard on the radio. It’s the same skill set only using your fingers instead of your voice. For me, it takes repetition both listening and application of what I remember.
The app Chordfy is a tool I use for learning new material. 500,000+ song library that you can play along with, and includes chord chards, easy stop and rewind, and the ability to slow down the playback speed so you can work out the difficult parts. It’s not expensive, and it works.
What I do with this amp, is to jam with a song until I know the song form, then go back I and fill in the details of each section one by one. Then I play the whole song repeatedly until I don’t need to follow the chord chart.
Keep in mind, when I started out 60 years ago, there were few options other than learning by ear. So we got pretty good at it.
That said, mastering standard notation will open a lot of doors for you as working musician. No knock on tabs, but the larger the ensemble, especially if you are playing with horns, it’s almost imperative.
Best wishes. I hope you found this information useful.