The Blues Thread (Surround-Stereo-Mono) Anything Goes.

[SeanSKA01]

Interesting, I see on Amazon the four 3 disc sets run about $40.00 each.
AMAZON BEAR FAMILY

I laughed out loud.

If you wait around they often go on sale on Oldies.com and at Deep Discount/ ImportCDs for about $27 each set.

The sound quality is amazing for recordings of that vintage and circumstances, and there are very informative liner notes for each song by blues and R&B authority Bill Dahl