Conversation so far:
What happened in The Platters early years?
The Platters formed in Los Angeles in 1952 and were initially managed by Federal Records A&R man, Ralph Bass.
Who were The Platters managed by after Federal Records A&R man Ralph Bass?
Bass then asked his friend, music entrepreneur and songwriter Buck Ram, to coach the group in hope of getting a hit record.
What was The Platters biggest musical hit?
The Great Pretender exceeded the success of their debut and became The Platters' first national #1 hit.

Question: what was their greatest accomplishment?
Self-contained rewrite: What was The Platters greatest accomplishment?