We've come to our final embellishment to the Autumn Leaves bass line. To really get a smooth "jazzy" feel to the bass line, I've added chromatic notes (1/2 steps) that are not in the scale or chord.
With a little care, you can even play a major 3rd over a minor chord or vice versa. The trick is that any chromatic tone needs to resolve to a stronger chord tone or it will sound like a mistake. When you play R-2-b3-3 against a major chord the b3 is a chromatic passing tone that leads to the strong sound of a major 3rd. When you play the same pattern against a minor chord it will work IF the next chord is a 4th away as occurs often in Autumn Leaves. In that instance the major 3rd is heard as a leading tone into the new Root of the next chord. Notice that the bass line has taken on the character of a sine wave and smoothly rises and falls. This is a good idea for a walking bass line in that it suggests motion but doesn't totally grab the ear like a more angular line. Try playing all of the lines from 15-18 and see how the line has transformed.
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