My question here is, can I blend in major and minor pentatonic scales within a bass line?
If so, when and where is that applicable?
For my level, whatever that is, I'm doing the following:
Learn to play the guitar line from My Girl (dm / / dm dm dm dm dm ).
Listen to The Joker, Brown Eyed Girl. Tighten Up
Listen to Berry Oakley's bass line from the Allman Brothers - Jessica
Listen to James Jamerson at Motown.
For minor pentatonics, listen to Led Zeppelin or Johnny Winter's early stuff...Willie Dixon songs...
THEY ALL COPIED WILLIE DIXON...
Rolling and Tumbling, Spoonful, Forty-Four...Messing With the Kid...
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Play along with your song. It's like cooking a Soul Stew, dig?
Simple quarter notes at first. Crawl - then walk.
You must determine the chord changes before anything else.
Roots first!
Add thirds (major or minor)
Add 5th and you have a triad. (Look out this could be a flatted fifth, eh?)
Add 7th for Major7 or Dominant7.
Now you're playing your chord progression with seventh chords and triads.
Now,
Play major pentatonic scale on major triads. Or major scale.
Play minor pentatonic scale on minor triads. Or one of the other minor scales.
Play the mixolydian mode on the dominant seventh chords.
Other minor scales are the Natural, Harmonic, Dorian and Jazz Minor.
Add 5b-4 to the minor pentatonic to get the blues.
Add 3b-3 to the major pentatonic to get the blues.
Add 3b-3 to the mixolydian mode to get the blues.
Always remember to play whole, half and quarter notes on bass.
Work with the drummer. This is not guitar. You are now in the Rhythm Section.
Add dotted quarter note for syncopation and shuffle beats.
Use straight eighth notes for rumble type songs.
Study how the chords and scales blend and connect on the fingerboard.
Don't forget the scale walk-ups into chords a la Johnny Cash (Remember Luther Perkins?). This is the BP's job to signal chord changes, as drummers roll into different song sections.
This is all simple stuff. I don't know what comes next level.
I play Dixieland on the upright, also.
It gets wild, but your fingers should always follow your ears.