I stumbled upon this gem from 1967 on youtube: The bass player is killing it! Lots of variations in the lines and the bass is up pretty high in the mix on my headphones. It doesn't sound like the album version is being used as a backing track. For one thing, the intro is played twice. So the question is, could this have been Jamerson playing live? I know he performed live with some of the Motown acts. Would a live band have even been used in a situation like this? Or is it a prerecorded backing track that Jamerson might have played on?