The list of Motown songs that don't fade seems to be growing - we know of four so far, unless you can add any more?
So far we have "Walk Away Renee" by The Four Tops, "Hello" by Lionel Ritchie, "I Just Called To Say I Love You" by Stevie Wonder, and "Behind A Painted Smile" by The Isley Brothers.
You may want to get picky, and say that Messrs. Wonder and Ritchie had their hits on Motown, not Tamla Motown, which does leave just the two from The Isleys and The Four Tops ... unless you know different?