Conversation so far:
Who were the original members of Martha and the Vandellas?
Martha and the Vandellas formed in 1957 as The Del-Phis by friends Annette Beard, Rosalind Ashford, Gloria Williams, and eventually included Martha Reeves.
Did Annette Beard, Rosalind Ashford, Gloria Williams, and Martha Reeves stay with The Del-Phis?
Martha Reeves moved up to lead vocalist after Gloria Williams' departure in 1962.

Question: What year was The Del-Phis formed?
Self-contained rewrite: What year was The Del-Phis formed?