The definitive and authorized Lynyrd Skynyrd documentary If I Leave Here Tomorrow -- which was shown earlier this year at South By Southwest -- will premiere on Showtime on August 18th. As we previously reported, sole surviving co-founder Gary Rossington told Yahoo Entertainment why director Stephen Kijak's doc works where so many others failed, explaining, "All the other documentaries were negative, and they really didn’t show how when we started, we were brothers. We’d die for each other. We grew up together, y'know? We were so happy, and it was a family. (The film) shows us, me and Ronnie (Van Zant) looking right at each other, and it was like, all my friends are dead and gone. I just went, 'Oh, my God.' It’s just real sentimental to me. I see all the memories and they’re alive; they’re like jumping beans in my brain."

Old friend and ZZ Top guitarist Billy Gibbons recalls the band giving Skynyrd an early break early on in its career: "We gave them their first paying job as Lynyrd Skynyrd back in '73. It was down in their home state of Florida. We had a Southern states run called The Outlaw Tour, and we had heard about this band from Florida. Well, we got down there, (and) we said, 'Hey, why don't you come out and have a night with us?'" in Mansfield, Massachusetts at Xfinity Centre.

AUDIO: REVEREND BILLY F. GIBBONS SAYS ZZ TOP GAVE LYNYRD SKYNYRD THEIR FIRST BIG BREAK