This was my first Billie Holiday recording, so maybe I'm biased.  But after hearing lots and lots of Billie since, I still think that this collection has been the most galvanizing of Billie Holiday listening experiences.  Her voice was in absolute perfect pitch here.  Her voice sounded a bit deeper in previous recordings (unless that's due to the production), and her voice got more ragged as the years progressed.  But here she sings like a cornet; the only person that I've heard that tried to sing like her and even came close was probably Dinah Washington (but in her own way).  Billie could sing at a pitch that is absolutely exhilarating.  If this is what you want to hear, or if this is making you curious, then get these recordings and you'll immediately know what I mean.