That leaves out ABBA! And ZZ Top!
Woody & Arlo, Buddy, Hendrix are all on the Top Grande. I need to listen more to Tom Waits as he is very highly critically rated. Definitely have to investigate further into Boggs. Bill Monroe, The Carter Family, Jimmie Rodgers, Lead Belly, Flatt & Scruggs, original Cajun artists, all have prominent spots on the Top Grande. I could spend a couple of years strictly dedicated to discovering and learning more of Taj Mahal's discography, and I probably should. Tried but I haven't been able yet to appreciate Zappa. I recognize his musical talent and pay the man his due respect, but I haven't yet warmed to his music. I went to one of his concerts here in Houston back in the late 70s and we walked out after 4 songs. (Sorry!) Dr. John was extremely talented but again, I'm not intimately familiar with his catalog. I remember his 70s single "Right Place, Wrong Time." I guess I need to dedicated an additional year to his music. I know I'll enjoy it. Phillips sounds like an interesting character, in a similar vein as W Guthrie politically.
I tried hard to steer GSH's "The Revolution Will Not Be Televised" into my Top 1000, but it just couldn't be squeezed in. It is spoken word so it's hard to even call it a song though it does obviously have musical and percussion elements. But I love it greatly, and it was so appropriate that it was inducted into the National Recording Registry in 2005. I'm not familiar with his other music, so he'll have to get in line. I'm on a classical music renaissance binge right now.