Interesting to bring up Spector. I would largely continue my thought of fraud with his productions, though there may be a slight difference or two. His Wall of Sound productions rather required extra singers to create the large, massed backing vocals so I'll give Spector a pass there. But if Ronnie was the only Ronette on, say, 'Walking In The Rain' in the same way that Diana is the only Supreme on, say, LC, for me the billing on the label is fraudulent.