I usually listen when I'm in my car. I've heard Glenn's Don't Give Up and The One You Love. Joe's The Radio Song and Randy's Hearts on Fire. I loved JD Souther and Linda Ronstadt's Silver Blue. Besides more I've forgotten now!
I also heard a clip of Glenn talking about writing Heartache Tonight with Bob Seger. He said he came in singing "Somebody's gonna hurt someone" and Bob chimed in with "There's gonna be a heartache tonight". He said that song was so easy to write. Loved hearing his voice!