I would think any tracks left unused for the upcoming set and future sets of the series would be contingent on whether the fellas can get clearance or the actual track would be damaging to the legacy of the artist [[bad notes, etc). While the idea that Motown's quality began to diminish in the late 60s is a debatable one, I would think that Keith and the guys wouldn't use their own personal likes and dislikes to determine what's good or bad in order to decide what to release and what to withhold. I can't imagine that too many of the producers during the time frame would characterize their unreleased Motown tunes as so bad they aren't worthy for release even 50 years later.
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