I have a pristine Trinity Sessions lp, played twice I think. Once when I bought it years ago, and once in the last year or two after I learned from someone in the industry the way the vocals were recorded. Some members of the band confirmed the rumor in an NPR interview. The singer was actually singing into her own microphone. The signal from her mic was played through a Klipsch speaker, which was then recorded by the mics that were recording the band.
When I first played the lp, I just found it boring, much as I think Tim suggests in the first response to this thread. Maybe I'm just not sophisticated enough to appreciate the reworking of some familiar songs. When I played it recently, the vocals just seem a little unnatural, but to appreciate that defect you have to have timbrally accurate speakers - this was not something I noticed with my old Monitor Audio speakers. I imagine she sounds great if you like the sound of Klipsch speakers.