Susan Stamberg talks with music critics Tom Moon and Will Hermes about what makes a true summer song. They start by listening to an old favorite of Susan's, a wistful, sweet song from 1976. And then we hear the latest hit by Nelly, "Hot in Herre," which celebrates summer heat with a call to get naked. Moon and Hermes say summer songs celebrate either love or partying. We also hear songs from Sheryl Crow, the Red Hot Chili Peppers, and the Beach Boys. (8:00) The songs heard in this interview are: "I'd Really Love To See You Tonight," by England Dan and John Ford Coley, from a CD called Super Hits of the 70's: Volume 18 on Rhino Records. "Hot in Herre" by Nelly, from the CD Nellyville, on Universal. "Soak up the Sun," by Sheryl Crow, from the CD C'mon C'mon, on A&M records. "Universally Speaking" by the Red Hot Chili Peppers, from the CD By The Way on Warner Brothers records "Wouldn't it Be Nice," by the Beach Boys, from the CD Pet Sounds on Reprise Records. "Planet Rock," by Afrika Bambaataa and the Soul Sonic Force, from the CD Planet Rock: The Album, on the Tommy Boy label.