Blues has many different styles
Vocal/Rock - Janis Joplin "I got them ol kozmic blues again" the remastered version
Delta/Acoustic - Blue Rider Trio "Harp, Steel and Guts" mapleshade records
Telarc records has a pretty good selection of well recorded blues, audioquest and mapleshade are other good companies for well recorded blues.
Vocal/Rock - Janis Joplin "I got them ol kozmic blues again" the remastered version
Delta/Acoustic - Blue Rider Trio "Harp, Steel and Guts" mapleshade records
Telarc records has a pretty good selection of well recorded blues, audioquest and mapleshade are other good companies for well recorded blues.