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.
What else did he do in his early career?
Joel left the band in 1967 to join the Hassles, a Long Island group that had signed with United Artists Records.

Question: Did he stay with that group long?
Self-contained rewrite: Did Billy Joel stay with The Hassles group long?