In keeping with the spirit of the OP's question, I'm eliminating all SACDs (such as Norah Jones' "Come Away With Me"), DVD-As and other specialized discs (except XRCD which is a standard CD). One of many possible great demo CDs is: "Mapleshade's Music Festival". Some have mentioned Patricia Barber but the exaggerated echo applied to her voice eliminates these otherwise excellent recordings, IMHO.
