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I totally agree and thought the same thing when I first heard KM sing. Songbird went platinum word of mouth and Eva never had a recording contract. The album was from recordings by her musician boyfriend of her over the years for keepsake. Eva was a natural blues singer.
Prior to Eva passing at 32 in 1994, she was on the rise and would have definitely come to be extremely famous. It was a tremendous loss for our world that badly needs singers like Eva, and that's why KM is viewed as a rare jewel as well. You just don't hear talent like this much anymore, at least I don't.
Eva was her own singer, she sang the songs she loved which is why she never had a recording contract. She was unwilling to sell out to the industry. She sang at clubs and also had an album called Blues Alley that did very well.
Wanted to add, that Katharine is only 21 years old! Eva was in her 30's when she passed and had a significant amount of vocal development at that point, though I understand she never took any vocal training which was pretty amazing. So, to compare them side to side, you must take that into consideration.
Katharine McPhee fans around the world