Conversation so far:
What happened in 1965?
Joel joined the Echoes, a group that specialized in British Invasion covers.
The Echoes began recording in 1965.
Was the Echoes successful?
CANNOTANSWER.
Did they release any albums?
CANNOTANSWER.

Question: What else did he do in his early career?
Self-contained rewrite: Other than join the Echoes, What else did Billy Joel do in his early career?