What are your top 5 favorite songs by Marvin Gaye?

BQ: Favorite Amerie song?

Here's mine:

1. Sexual Healing
2. Mercy Mercy Me (The Ecology)
3. Distant Lover
4. Can I Get a Witness
5. I Heard It Through the Grapevine

BA : "Talkin' to Me" http://www.youtube.com/watch?v=CXrcd_q6U84

what's yours?