Every field of music has some good covers, no matter how you define “good”. I generally like beauty over cleverness. Not all of these are beautiful, some are just by famous cartoonists or illustrators or painters. Henrietta and Cliff Condak, Edward Sorrel, Ben Shahn are all quite famous. Gray Foy isn’t, I guess, but was sure a great illustrator. The vast majority of classical records coming out in this 20 year period, 1955 to 1975, were dull – pictures of the conductor, the soloist or the composer, or reproductions of paintings from long ago. But in every era, for every school of music, there are good covers.