Okay, Ike and Tina it is.
Okay, Turtles are out, replaced by Donovan.
Come on, you can't count Curtis Mayfield as a new artist in 1970 any more than you can count Paul McCartney as a new artist in 1970. I don't think those items are on the "Debut Albums" and "Debut Singles" lists, so they don't belong here either IMO.
I'll leave the 4 Seasons in for now.
I figured that was the explanation for Mayfield but since I didn't see anything in the criteria about it, I had to ask.
Actually, maybe the best solution would be this: Establish it so that any featured member of an artist can't have recorded earlier, that way you're not only eliminating McCartney, Mayfield, et. all, but also making it more clear-cut for groups, so the Four Seasons would be out, as would Ike & Tina Turner though. The word "NEW" implies totally new, not just new in a certain context. Of course, then you'd have to drop Zeppelin, so it becomes a problem.
If you were looking for someone to replace the Seasons if you decide to remove them from '62, throw in Arthur Alexander. I could be wrong but I don't think his first record was released in '61. If that's the case, he had three charting records and all six of the sides are classics, many of which have been covered repeatedly by big names (Soldier Of Love - Pearl Jam, You Better Move On - Stones, etc.). Plus the style helped establish the southern-soul sound, mixing country influences in with R&B.