Attention BoTBers, today’s battle song feature’s Gayle’s hit song, “I Heard It Through The Grapevine” near the end of the post. Feel free to skip to the bottom or read about him in my newest edition of Famous Musicians & Their Musical Kids series. In Part 1, I showcased 50s teen-idol Ricky Nelson & Sons, and last month I featured Mr. Cool Dean Martin. Today, I’m bringing the flavor of R&B your way with the late Prince of Soul, Marvin Gayle. I only knew Mr. Gayle as a singer but he got his start as an in-house session drummer who…