Who sang the version of "Summertime" that received a lot of airplay on American pop radio in the late 60s or early 70s? I've been wracking my brain, searching youtube, and I can't find it. It wasn't slow like the Porgy & Bess musical, it had a more uptempo beat, but wasn't the sampled/mixed mess it has become today. I've listened to quite a few versions the last several days trying to find it, my memory is too clouded up to be able to say clearly. There was definitely singing, and I'm pretty sure it was sung by a woman.
I'm pretty sure it wasn't a jazz standards cover, nor Janis Joplin's cover. The 90s/2000s and later remakes are okay, but they changed the song too much for my taste. Wikipedia lists a few artists that covered it, but they are not the same either. One of the closest I could find was this Norah Jones cover. This Olivia Kuper Harris version is good too. It was NOT Mungo Jerry's "In the Summertime."