You remember this classic by The Jackson 5, right? It's pretty sweet.
The Jackson 5 > I Want You Back
Okay, now check out David Ruffin's take, he totally kills it. I daresay I like Ruffin's version better. His voice is so soulful. I first found this on the Motown Sings Motown Treasures album. It's basically like Motown artists covering Motown classics, and it's fucking awesome.
David Ruffin > I Want You Back