If you know the key of a piece of music you can then work it out quickly. Other things you can do:
- Make your own bass lines up in different keys
- Recognise harmony by ear
- Improvise like an expert
The following lessons go hand in hand with this one:
4 Common Scales For Bass Players
What Are Relative Major And Minor Scales?
Bass Guitar Music Theory: The 7 Arpeggios From C Major
Harmonising The Natural Minor Scale: Play Bass Lines, Chords & Solos!
Make sure to watch them all and you will start to understand and be able to use this gold dust!