the Jazz title could be either one of Duke Ellington, Gil Evans,
Charlie Mingus, or The Modern Jazz Quartet..
R&B maybe either Donny Hathaway, Roberta Flack,
Spinners,
Average White Band, Graham Central Station, Aretha Franklin, or
Dionne Warwick..
Singer/Songwriter has many possibilities, could be David Gates, Carly Simon, Randy Newman,
Gordon Lightfoot,
James Taylor, Joni Mitchell, Judy Collins, Arlo Guthrie, or Mickey Newbury..
Soft Rock may be The New Seekers,
sEagle, Sergio Mendes
, Seals & Crofts,
America, Bread, Souther-Hillman-Furay Band..
edit: i'm guessing this batch won't have any more Alice Cooper or Jefferson Starship Quads, or WEA artists that don't fit into any of those categories, such as the James Gang, Bill Wyman, Deaf School, Stardrive Ft. Robert Mason, Herbie Mann, or Bette Midler!?
edit: wonder if there's any unreleased Quads lined up by Rhino for Quadio, maybe some Billy Cobham