slow: WAAAAAY too many, but "If I Was Your Girlfriend" by Prince is my heart- NO one can talk during that song. I love just about any jam by His Royal Badness, though, including "Adore."
fast: "Got to Give it Up" by Marvin Gaye. My dad made sure EVERYONE in the house loved that song when I was a child, played it almost every day!
Man, I HATE limiting myself.. too many jams out there... LOL
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Subtlety is the key ;o)