Conversation so far:
What was Martha and the Vandellas's Bless You?
Bless You is a 1971 hit single by Motown girl group Martha and the Vandellas (credited as Martha Reeves & the Vandellas).
What did Bless You do for Martha and the Vandellas' career?
The single became Martha and the Vandella's last major hit. Over a year later, the group would disband, and Martha Reeves would pursue a solo career.
What else is important about this Martha and the Vandellas time frame release of Bless You?
Martha Reeves, out of the group temporarily due to illness, recovered and returned; Rosalind Ashford was replaced by another former member of the Velvelettes, Sandra Tilley.

Question: Why was Ashford replaced?
Self-contained rewrite: Why was Martha and the Vandellas’ Rosalind Ashford replaced?