I agree, I love this bassline!
I Want You Back/Jackson 5 bass play along by Cara
The great Wilton Felder on bass on the Jackson brothers' first single for Motown, I Want You Back. I hear how this definitely influenced the bassline on "Your Smiling Face" with the constant double clutches and descending line, anyway just a genius bass part and very fun to play. I picked this up very quickly, just came naturally. Hope you like it!
https://youtu.be/B8i53iCabtQ