"Don't Keep Me Wonderin'" (1970)
From the band's second album, Idlewild South, this Gregg original extends his writing streak at the time. "Tell me why when the phone rings baby/You're up and across the floor," Gregg pleads, answered by his brother Duane's glorious slide guitar. (OK, there were no cell phones in 1970.) The way Gregg's voice seems to wander on and off the mic only adds to its power.