Here are some YouTube videos of songs that each of the two groups did:
--"Poor Boy" by the Royalettes https://www.youtube.com/watch?v=3wS2DD-4Vm8
--"Look In My Eyes" by the Chantels https://www.youtube.com/watch?v=7L63c2DTpag
--"He Is My Man" by the Royalettes https://www.youtube.com/watch?v=_GzlvT_RJkc
--"Maybe" by the Chantels https://www.youtube.com/watch?v=l_1h4YzCLZE