Cathy,
You explained the "walking bass" concept quite well. It's kind of like the typical left hand action in an old-style piano boogie woogie. It pretty much follows the chord structure with sometimes an added second or (more often) sixth interval, going up in order of pitch and then back down in the same order in straight rhythm. The "shake hands with the Father" part of "Make Way for the Lady" epitomizes the walking bass.
Heather
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