Bass guitar fills/scales?

Question

Something i struggle with. Never know what notes will be in key and stuff. any tips? i play in a rock band. Just need help with like when the guitarist is playing a chord progression how to know what notes i can play along with it so I'm not just playing his bass notes.

Answer 1

You need to pick up a music theory book.  

You need to learn how to recognize keys.  Also modes would be very beneficial as well.