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The hard part for me on scales is staying focused. They are just so boring. But if I break it into 5 minute sessions, I at least convince myself that I'm doing some good.
I assert that scales are boring because few of us are paying attention to the right things or varying how we approach scales. e.g.
How many different ways can you play each scale on your #1 bass?
Are you as comfortable doing the position shifts on each string as on the others?
Do you play from the lowest note in that scale to the highest or do you play strictly from root to octave?
Can you play an arbitrarily chosen scale from the highest note to the lowest without first playing up the scale?
Can you play triads and arpeggios in every key you encounter
in your set list? Descending as well as ascending? If jazz is your gig: 9ths, 11ths and 13ths?
Is your LH-RH coordination equally good in all these scale variants? How about your dynamics? Equally loud across the neck and from nut to neck pickup? Are you sure?
Have you even noticed those last two after you started playing gigs?
Use all plucking combinations (i-m-i-m, m-i-m-i, i-a-i-a, a-i-a-i, m-a-m-a, a-m-a-m; “a” is “annular” or ring finger) including patterns that use the thumb if you do.
If slap is in your repertoire can you slap scales and make them sound musical?
Do you use the circle of fifths/fourths to determine what order to play?
Invent etudes. e.g. Play up the scale from the root then down to the third. Make that the root of the next scale and so on. Bonus for minor keys.
A friend of mine gets his scale playing jollies by using jazz tune chord progressions to set the order of scales he’ll practice. Getting to know the changes, eh?
Do you speak the names of the notes as you play?
Work on muscle control by slowly playing a scale, fretting so lightly that every note buzzes equally. If you can do that then only the slightest added force gives you a clean sound. Embed that sensation in your playing and you’ll never strain your fingers playing an all day gig.
All the above in both major and minor keys.
That’s a start and until now I didn’t mention modes. The floor is open to all others who have suggestions for good uses of scale practice.
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